MinecraftEdu does not launch

[Golfboy]

Hi All,

Hope you can help, we are running 1.6.4 and it will open the launcher but when clicking "lauch" nothing happens. Login mode is set to minecraftedu. I have done some research, most people fixed it by installing 64-bit Java although this has not worked for me, even using Java RA to strip out old versions. I checked the event log etc. Has anybody encountered this before?

Thanks in advance

[Lisa Douthit]

Are you using any mods?

[Shaun Hartwig]

I had this same issue, while using Windows 8 32bit and running either version of java, be it version 6 32bit or 7 32bit.
But i had no issues on windows xp 32bit, besides 10 minute load times when launching program.

[to...@teachergaming.com]

Like Lisa said first check if a mod is causing this. If you have no mods and it still doesn't launch you could try the following:

- Turn debugging on from the launcher advanced settings. You can change the setting from the launchers top menu Settings -> Advanced settings -> Debug. 

- Try to run the client.

- When it fails to launch navigate to folder "minecraftedu\debug\" there should be a "client.log" file.

- Paste the contents of that file here and we can take a look if there's something wrong.

[Golfboy]

Thank you, I shall give these a try

[Golfboy]

I have checked the mods folder and this is empty so I assume there are no mods. I ran debug and this is the contents of the client log file:

 

Debug logging for Minecraft Client started at: 22. January. 2014 10:02
###############################################
PATHS:
pathMapQuestionLocationsFile C:\Program Files (x86)\minecraftedu\minecraft/quizQuestions.ini
pathOrigOptionsFile C:\Program Files (x86)\minecraftedu\minecraft/../launcher_res/settings/options_orig.txt
pathServerTexturesFile C:\Program Files (x86)\minecraftedu\minecraft/resourcepacks/eduserverresourcepack.zip
pathOptionsFile C:\Program Files (x86)\minecraftedu\minecraft/options.txt
pathEduSettingsFile C:\Program Files (x86)\minecraftedu\minecraft/minecraftedusettings.ini
pathEduKeybindings C:\Program Files (x86)\minecraftedu\minecraft/../launcher_res/settings/edukeybindings.ini
pathExternalLibraries ./lib/
pathDebugWritingFile C:\Program Files (x86)\minecraftedu\minecraft/../debug/client.log
pathLauncherSettingsFile C:\Program Files (x86)\minecraftedu\minecraft/../launcher_res/settings/launchersettings.ini
###############################################
---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 22/01/14 10:02
Description: Initializing game

org.lwjgl.LWJGLException: Pixel format not accelerated
 at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
 at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
 at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:244)
 at org.lwjgl.opengl.Display.createWindow(Display.java:306)
 at org.lwjgl.opengl.Display.create(Display.java:848)
 at org.lwjgl.opengl.Display.create(Display.java:757)
 at org.lwjgl.opengl.Display.create(Display.java:739)
 at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:513)
 at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:875)
 at net.minecraft.client.main.Main.main(Main.java:98)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
 at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
 at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
 at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
 at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:244)
 at org.lwjgl.opengl.Display.createWindow(Display.java:306)
 at org.lwjgl.opengl.Display.create(Display.java:848)
 at org.lwjgl.opengl.Display.create(Display.java:757)
 at org.lwjgl.opengl.Display.create(Display.java:739)
 at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:513)

-- Initialization --
Details:
Stacktrace:
 at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:875)
 at net.minecraft.client.main.Main.main(Main.java:98)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
 at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
 Minecraft Version: 1.6.4
 Operating System: Windows 7 (amd64) version 6.1
 Java Version: 1.7.0_25, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 19998456 bytes (19 MB) / 68890624 bytes (65 MB) up to 709558272 bytes (676 MB)
 JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx700m
 AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
 Suspicious classes: FML and Forge are installed
 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
 FML:
 Launched Version: mceduforge
 LWJGL: 2.9.0
 OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
 Is Modded: Definitely; Client brand changed to 'fml,forge'
 Type: Client (map_client.txt)
 Resource Pack: Default
 Current Language: ~~ERROR~~ NullPointerException: null
 Profiler Position: N/A (disabled)
 Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
#@!@# Game crashed! Crash report saved to: #@!@# C:\Program Files (x86)\minecraftedu\minecraft\crash-reports\crash-2014-01-22_10.02.25-client.txt

 

Thanks in advance

[to...@teachergaming.com]

It's a graphics error. What kind of graphics card do you have? Try updating the drivers to the latest version.

[EduElfie]

Reading that, while not a coder, it looks like perhaps your graphics card are not capable of running Minecraft. Have you tried running 'normal' Minecraft instead of MinecraftEdu and do you get the same error if you do?

Elfie.

[Eric]

It's a conflict between your video card and Minecraft - it's not the fault of Edu. Take a look at this thread from the official Minecraft forum for posts from people with the same problem, some of whom solved it:

http://www.minecraftforum.net/topic/1028-orglwjgllwjglexception-pixel-format-not-accelerated/

[Matt Coia]

I've had to do that before as well. And it was hit or miss with which computers in my class needed it. Some did, some didn't. 

If you have permissions to do so, go into your device manager and get to the video device properties and then try to update the driver from there. 

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[Diane Main]

I have a student using a MacBook Air, and I suspect his issue is not the graphics driver.  Anyone have trouble running MCEdu on MB Air?

He uses startlauncher.jar and gets into the launcher, but when he clicks the launch button, it briefly turns green and then the application opens and immediately closes.

Any ideas on what I can try for him?

Thanks,

Diane

[Matt Coia]

java update?

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[Diane Main]

He tells me he updated Java.  How can I tell?  I don't have his laptop with me.

Diane Main
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http://www.dianemain.com

Google Certified Teacher (NorCal 2006)

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See my vizify bio!

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[Matt Coia]

I'm not very good with macs so hopefully someone else has a better clue.  On a windows machine I would find and delete the old java folders and redownload a fresh install of java 7.

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[Schmidt, Jason]

Mac has its own version of Java, so chances are that is not the issue. You can check by running a software update from the Apple menu. When I click use the .jar file to launch MinecraftEDU on my MacBook Air, I click on the Launcher.jar file and this has been successful. Are you sure all the game files are in the minecraftEDU folder? Have you tried copying the folder from one computer where it works properly to this computer? I’m just trying to rule out solutions! :)

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Bennington Public Schools

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jasc...@bennps.org

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The person who never made a mistake never tried anything new —Albert Einstein

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[EduElfie]

You could also look into the log file. That might point you in the right place for the crash. The file you want to look at is the forgemodloader-client.log which is the /minecraftedu/minecraft folder.

Elfie.

java update?

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[stephane...@collegejeannedarcfougeres.fr]

Hello,

I've got the same problem on a windows 7 computer.

Here is the bug file :

"Debug logging for MinecraftEdu Launcher started at: 12. novembre. 2014 19:00

###############################################

PATHS:

###############################################

Loaded empty language from file, returning default!

Launcher 1.2.1 (through bootstrap 4) started on windows...

Current time is Nov 12, 2014 7:00:11 PM

System.getProperty('os.name') == 'Windows 7'

System.getProperty('os.version') == '6.1'

System.getProperty('os.arch') == 'amd64'

System.getProperty('java.version') == '1.8.0_25'

System.getProperty('java.vendor') == 'Oracle Corporation'

System.getProperty('sun.arch.data.model') == '64'

Loaded 2 profile(s); selected 'MinecraftEdu'

mceduforge

Looking for old natives to clean up...

Unpacking natives to C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1432172733781

Launching in C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft

Running C:\Program Files\Java\jre1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx700m -Dfml.ignoreInvalidMinecraftCertificates=true -Djava.library.path=C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1432172733781 -cp C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\minecraftedu\mceduforge\0\mceduforge-0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\sk89q\worldedit\5.5.6\worldedit-5.5.6.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\realms\1.2.4\realms-1.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\authlib\1.5.13\authlib-1.5.13.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge.jar net.minecraft.launchwrapper.Launch --username Player26421 --version mceduforge --gameDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft --assetsDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\assets --assetIndex 1.7.10 --uuid 00000000-0000-0000-0000-000000000000 --accessToken ${auth_access_token} --userProperties ${user_properties} --userType ${user_type} --userProperties {} --tweakClass cpw.mods.fml.common.launcher.FMLTweaker 

Client> [19:00:23] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:00:23] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:00:23] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:00:23] [main/INFO] [FML]: Forge Mod Loader version 7.10.25.0 for Minecraft 1.7.10 loading

Client> [19:00:23] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_25

Client> [19:00:23] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:00:23] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

Client> [19:00:23] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:00:23] [main/ERROR] [LaunchWrapper]: Unable to launch

Client> java.util.ConcurrentModificationException

Client> at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]

Client> at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]

Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]

Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Game ended with no troubles detected (exit code 0)

Deleting C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1432172733781

Loaded 2 profile(s); selected 'MinecraftEdu'

mceduforge

Looking for old natives to clean up...

Unpacking natives to C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1714878368071

Launching in C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft

Running C:\Program Files\Java\jre1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx700m -Dfml.ignoreInvalidMinecraftCertificates=true -Djava.library.path=C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1714878368071 -cp C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\minecraftedu\mceduforge\0\mceduforge-0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\sk89q\worldedit\5.5.6\worldedit-5.5.6.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\realms\1.2.4\realms-1.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\authlib\1.5.13\authlib-1.5.13.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge.jar net.minecraft.launchwrapper.Launch --username Player36532 --version mceduforge --gameDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft --assetsDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\assets --assetIndex 1.7.10 --uuid 00000000-0000-0000-0000-000000000000 --accessToken ${auth_access_token} --userProperties ${user_properties} --userType ${user_type} --userProperties {} --tweakClass cpw.mods.fml.common.launcher.FMLTweaker 

Client> [19:05:05] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:05:05] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:05:05] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:05:05] [main/INFO] [FML]: Forge Mod Loader version 7.10.25.0 for Minecraft 1.7.10 loading

Client> [19:05:05] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_25

Client> [19:05:05] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:05:05] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

Client> [19:05:05] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:05:05] [main/ERROR] [LaunchWrapper]: Unable to launch

Client> java.util.ConcurrentModificationException

Client> at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]

Client> at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]

Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]

Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Game ended with no troubles detected (exit code 0)

Deleting C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1714878368071

Loaded 2 profile(s); selected 'MinecraftEdu'

mceduforge

Looking for old natives to clean up...

Unpacking natives to C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1812977777173

Launching in C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft

Running C:\Program Files\Java\jre1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx700m -Dfml.ignoreInvalidMinecraftCertificates=true -Djava.library.path=C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1812977777173 -cp C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\minecraftedu\mceduforge\0\mceduforge-0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\sk89q\worldedit\5.5.6\worldedit-5.5.6.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\realms\1.2.4\realms-1.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\authlib\1.5.13\authlib-1.5.13.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge.jar net.minecraft.launchwrapper.Launch --username Player38932 --version mceduforge --gameDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft --assetsDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\assets --assetIndex 1.7.10 --uuid 00000000-0000-0000-0000-000000000000 --accessToken ${auth_access_token} --userProperties ${user_properties} --userType ${user_type} --userProperties {} --tweakClass cpw.mods.fml.common.launcher.FMLTweaker 

mceduforge

Looking for old natives to clean up...

Deleting C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1812977777173

Unpacking natives to C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1817733194129

Launching in C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft

Running C:\Program Files\Java\jre1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx700m -Dfml.ignoreInvalidMinecraftCertificates=true -Djava.library.path=C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1817733194129 -cp C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\minecraftedu\mceduforge\0\mceduforge-0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\sk89q\worldedit\5.5.6\worldedit-5.5.6.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\minecraft\launchwrapper\1.9\launchwrapper-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\realms\1.2.4\realms-1.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\commons\commons-lang3\3.2.1\commons-lang3-3.2.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\com\mojang\authlib\1.5.13\authlib-1.5.13.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge.jar net.minecraft.launchwrapper.Launch --username Player4959 --version mceduforge --gameDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft --assetsDir C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\assets --assetIndex 1.7.10 --uuid 00000000-0000-0000-0000-000000000000 --accessToken ${auth_access_token} --userProperties ${user_properties} --userType ${user_type} --userProperties {} --tweakClass cpw.mods.fml.common.launcher.FMLTweaker 

Client> [19:06:43] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:06:43] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:06:43] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:06:43] [main/INFO] [FML]: Forge Mod Loader version 7.10.25.0 for Minecraft 1.7.10 loading

Client> [19:06:43] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_25

Client> [19:06:43] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:06:43] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

Client> [19:06:43] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:06:43] [main/ERROR] [LaunchWrapper]: Unable to launch

Client> java.util.ConcurrentModificationException

Client> at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]

Client> at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]

Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]

Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Game ended with no troubles detected (exit code 0)

Deleting C:\Users\Pol\AppData\Roaming\minecraftedu\minecraft\versions\mceduforge\mceduforge-natives-1817733194129

Client> [19:06:48] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:06:48] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:06:48] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

Client> [19:06:48] [main/INFO] [FML]: Forge Mod Loader version 7.10.25.0 for Minecraft 1.7.10 loading

Client> [19:06:48] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_25

Client> [19:06:48] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:06:48] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

Client> [19:06:48] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

Client> [19:06:48] [main/ERROR] [LaunchWrapper]: Unable to launch

Client> java.util.ConcurrentModificationException

Client> at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_25]

Client> at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_25]

Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]

Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Game ended with no troubles detected (exit code 0)"

Any clue ?

When I launch Minecraft instead of minecraftedu it works.

Thanks.

Stephane

[EduElfie]

Which version of 1.7.10 are you running? I think this may be the Java 1.8 issue, so try downloading the latest installer from the downloads page and make a fresh install using the newly downloaded installer. Then see if the same issue happens.

Elfie.