Error in building flutter app

[Pradeep Kumar Reddy Kondreddy]

Build is failing with following error. Can somebody help me in resolving this issue.
Could not resolve all artifacts for configuration ':admob_flutter:classpath'.
   > Could not resolve org.checkerframework:checker-qual:2.5.2.
     Required by:
         project :admob_flutter > com.android.tools.build:gradle:3.3.0 > com.android.tools.analytics-library:shared:26.3.0 > com.google.guava:guava:26.0-jre

[Suzuki Tomohiro]

What did you do before getting this error?

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[Pradeep Kumar Reddy]

$'flutter build appbundle' command is throwing that error.

[Suzuki Tomohiro]

Good. Any change since the last time the command worked fine?

[Pradeep Kumar Reddy]

No, I never tried that command earlier when I was developing the app. I used to run the app from the android studio run button. As part of app release preparations, i have added KeyStore properties and signingConfigs in app/build.gradle file, changed compileSDKVersion and targetSDK version to 29. Updated gradle build tools to 4.0.0.

Here is my app/build.gradle file

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('keystore.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    compileSdkVersion 29
    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }
    lintOptions {
        disable 'InvalidPackage'
    }
    defaultConfig {
        applicationId "com.xxxx.xxxx"
        minSdkVersion 16
        targetSdkVersion 29
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        multiDexEnabled true
    }
    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        }
    }
    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.release
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

and this my android/build.gradle file

------------------------------------------------------

buildscript {
    ext.kotlin_version = '1.3.72'
    repositories {
        google()
        jcenter()
        maven {
            url 'https://dl.google.com/dl/android/maven2'
        }
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.0.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

[Suzuki Tomohiro]

I see your build cannot resolve artifact org.checkerframework:checker-qual:2.5.2. Which repository (google() or jcenter()) do you think provides the artifact?

[Pradeep Kumar Reddy]

From the below error messages, I can see that it is from jcenter().

[Fatal Error] checker-qual-2.5.2.pom:2:1: Content is not allowed in prolog.

FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.

   > Could not resolve org.checkerframework:checker-qual:2.5.2.
     Required by:

         project : > com.android.tools.build:gradle:3.5.0 > com.android.tools.analytics-library:crash:26.5.0 > com.google.guava:guava:27.0.1-jre

      > Could not resolve org.checkerframework:checker-qual:2.5.2.

         > Could not parse POM https://jcenter.bintray.com/org/checkerframework/checker-qual/2.5.2/checker-qual-2.5.2.pom
            > Content is not allowed in prolog.
   > Could not resolve org.glassfish.jaxb:jaxb-runtime:2.2.11.
     Required by:
         project : > com.android.tools.build:gradle:3.5.0 > com.android.tools.build:builder:3.5.0 > com.android.tools:sdklib:26.5.0 > com.android.tools:repository:26.5.0
      > Could not resolve org.glassfish.jaxb:jaxb-runtime:2.2.11.
         > Could not parse POM https://jcenter.bintray.com/org/glassfish/jaxb/jaxb-runtime/2.2.11/jaxb-runtime-2.2.11.pom
            > Could not resolve com.sun.xml.bind.mvn:jaxb-runtime-parent:2.2.11.
               > Could not resolve com.sun.xml.bind.mvn:jaxb-runtime-parent:2.2.11.
                  > Could not parse POM https://jcenter.bintray.com/com/sun/xml/bind/mvn/jaxb-runtime-parent/2.2.11/jaxb-runtime-parent-2.2.11.pom
                     > Could not resolve com.sun.xml.bind.mvn:jaxb-parent:2.2.11.
                        > Could not resolve com.sun.xml.bind.mvn:jaxb-parent:2.2.11.
                           > Could not parse POM https://jcenter.bintray.com/com/sun/xml/bind/mvn/jaxb-parent/2.2.11/jaxb-parent-2.2.11.pom
                              > Resetting to invalid mark

[Pradeep Kumar Reddy]

Major change that i did is, i updated my gradle version from 4.10.1 to 6.5

[Suzuki Tomohiro]

Do you want to share all command line output?

Assuming you use Mac or Linux, can you run this command?

curl -v 

https://jcenter.bintray.com/org/checkerframework/checker-qual/2.5.2/checker-qual-2.5.2.pom

I don’t know Windows.

[Pradeep Kumar Reddy]

Attached the curl command output.

[Suzuki Tomohiro]

I don’t see any problem. Strange. Do you want to share minimum reproducible project?

[Pradeep Kumar Reddy]

I'm getting this error after i upgraded my android studio to version 4.0.0 and also upgraded my gradle version to 6.5.   

I'm getting a plugin error also Plugin Error: Plugin "Flutter i18n" is incompatible (target build range is 192.0 to 192.*).

  Do you know how to downgrade the gradle version used by android studio ??  

[Pradeep Kumar Reddy Kondreddy]

Clearing the gradle cache fixed the issue. Refer the following link for details

https://stackoverflow.com/questions/62360882/gradle-build-error-fatal-error-checker-qual-2-5-2-pom21-content-is-not-allo/62361223?noredirect=1#comment110326987_62361223

[Suzuki Tomohiro]

Great. Thank you for update.

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