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Narkis Eatman
If you have solutions, corrections, or suggestions for improvement, either make them directly, post to the "Fallout NV Mod Conflict Troubleshooting" thread in the "Fallout New Vegas Mod Troubleshooting" forum, or contact the current maintainer by Private Message (PM).
This a collection of specific common problems and solutions, along with a general checklist of things known to contribute to problems, collected from around the web. The "Fallout NV Mod Conflict Troubleshooting" thread in the "Fallout New Vegas Mod Troubleshooting" forum is for questions, suggestions, and discussion of this article's contents.
If you haven't already, it is suggested to read the wiki article FNV General Mod Use Advice first to understand basic terminology as used here and differences in FNV from other games you may be used to modding.
Troubleshooting is a logical process of elimination. If all logic fails, you have to revert back to a vanilla game and slowly re-install mods, testing each one thoroughly before adding the next. It is a trade-off of "time" versus "effort". Where that tipping point lies is up to you. This is why you are always advised to follow a slow "install and test each mod one at a time" procedure when first setting up your game. Then you know specifically which mod is causing your problem, which saves time.
The How to ask for help wiki article applies to any game. Read it before posting your next problem in the forums to speed up getting to the correct solution. The time you are wasting otherwise is not just your own.
Standard list of things to ask yourself about your current FNV problem:
00. Did you install Steam under the default location of the "C:\Program Files" tree? This causes many "strange" problems not otherwise explainable. As painful as it may sound, read the wiki article Installing Games on Windows Vista+ and move at least FNV. That article has a link to the official Steam Procedure (a good indication that they now recognize the need to correct this). This should be the first solution you try. Otherwise you will spend a lot of time and effort trying other solutions, and still have to move the game files in the end anyway.
As of 13 May 2019 all "workarounds" that depend upon continued use of the old API will no longer function. That API has been removed, as previously announced more than two years previously. This includes but is not limited to:
Some people are finding that even after updating NMM to v0.65.4 they still get a "script exception" message when installing some mods (such as UIO and MCM). This seems to be resolved by this suggestion from user ElysianMod:
02. What most recently changed (as far as what you have deliberately done to your game is concerned: New, updated, or removed mods or plugins)?
02b. Did any of the following which interact with the game get updated or changed recently. They are prime suspects if nothing in the game itself changed:
03. If you have recently "verified local files" or "re-installed" the game, try renaming both the INI files in the "C:\Users\\Documents\My Games\FalloutNV" folder, and let the game rebuild them. (There might have been some unexpected changes.) Rename to anything you choose. I usually just add to the extension: from ".ini" to ".ini.old". The purpose is to be able to examine the old files for things you want to be able to replicate in the new versions of the same file.
04. Does the most recent mod change use New Vegas Script Extender (NVSE) or supplemental plugins like JIP NVSE Plugin or "Lutana NVSE Plugin"? Check that log (in the game's root folder: i.e. "\steamapps\common\Fallout New Vegas").
Note that writing a file to disk is one of the slowest things a program will do. Having "logging" enabled will have some impact on performance, the degree of which will depend upon your system. It is recommended to leave "EnableGameErrorLog=0" and set it to "=1" only when and as long as you need logging enabled.
05. Did the mod need to be added to Mod Configuration Menu (MCM) / One HUD (oHUD) / User Interface Organizer (UIO)? (Those mods need to see it when they are installed. See the wiki article HUD-UI-Menu issues and re-install them.)
06. Is your version of Windows 32 or 64-bit? (32-bit may require BOOT.INI changes to use more than 2GB of memory. See this 2-4GB game memory limits and solutions article.) FNV is a 32-bit game, so you need the 32-bit versions of any downloadable tools or libraries, like "C++ Runtimes" or "DirectX drivers" installed on your 64-bit system. 32-bit libraries are not interchangeable with 64-bit versions. They install to different locations. There is a reason MS makes both versions available.
07. Are you using a FNV4GB Loader such as 4GB Fallout New Vegas Updated or an LAA flag Patcher like FNV 4GB Patcher? (Increases available memory. But see the previous question about 32/64-bit Windows. It's related.) Did you turn off any "anti-virus" checking software before patching? (They see any attempts to alter programs as "malware".)
08. Are you using an ENB preset? (Alters the graphics environment, including INI changes.) If you aren't sure, then probably not. This is a "third party tool" you would have to manually add. You should wait until you have a stable game before adding a "post-processor" like it to the mix.
09. Are you using Reshade/SweetFX? (Alters the graphics environment, including INI changes.) You should wait until you have a stable game before adding a "post-processor" like it to the mix.
10. Check the game graphic & ENB/SweetFX options do not conflict with video driver settings. (Anti-aliasing, ambient occlusion, anisotropic sample size, v-sync, anything else that is mentioned.) If you didn't install either of these then the question does do not apply.
11. Are you using LOOT to sort your mod "load order" (LO)? (Reduces mod conflicts.) If you don't like LOOT's results, or wish total control over your LO, see the wiki article Load order and you for an approach to organizing the LO and creating a "merge patch" file to manually resolve conflicts.
12. Do you have more than 130 active plugins in your LO, or more than 140 plugins installed (active or not) in the game DATA folder? The game can have problems with anywhere from roughly 130-140 active, or too many installed, depending upon your system. This may manifest in any number of strange ways to include apparent missing meshes and textures that were there before, along with CTDs.
13. If you are having a "red icon" problem, see the ArchiveInvalidation (by Manager) sub-topic.
16. If the LO has changed, re-run FNVLODGen after LOOT. (Rebuilds LOD quadrants (quads), which are "load order" dependent.)
17. Use FNVEdit (loading the entire LO) to check for Masters that are missing or loading after Dependencies. See the wiki tutorial Missing Masters. There is full documentation of FNVEdit (for both FO3 and FNV) in the online docs Tome of xEdit and the downloadable PDF FNVEdit Training Manual.
18. Are you using a Wrye Flash Bashed Patch or a manually created "merge patch" file? (Resolves record level conflicts.) See S.T.E.P. Merging Plugins Guide which covers both approaches, or the video Making a Merge Patch by Roy Batty for the "merge up" approach. (Use of "Mod Organizer" is not required.) Use the Wrye Bash Pictorial Guide to quickly get functional with "Wrye Flash", which I think is the easier approach for a novice modder.
19. If you are using "Wrye Flash" to create a "Bashed Patch", have you gotten all "green" checkboxes for all your mods? See the first post in the pinned thread Fallout New Vegas Beginners guide to modding by gromulos.
20. Was there an update to a mod that has been included in a "merged plugins" or "merge patch" file? Rebuild the "merge" file.
21. Did any system or driver updates occur? (Third party processes might be the cause if nothing else changed.)
22. Does your hardware meet the game's minimum requirements?
23. Have you tried running the game in "windowed mode"? This has been known to unexpectedly fix CTDs and "out of memory" errors on some older hardware. If you prefer the "borderless" version of "windowed mode", install New Vegas Script Extender (NVSE) and use the One Tweak for FNV mod.
24. Try turning off any unnecessary background processes, such as "anti-virus" or "anti-malware" programs (unneeded if you are running your game in "offline" mode), multiplayer "overlays" like "OverWolf" (this is single-player after all), the Steam overlay, etc., at least on a temporary basis to see if they are interfering.
25. Finally, the problem might be an overheating hardware component. This usually shows up after a period of time which is typically fairly consistent but unpredictable as to when it manifests. Try installing and keeping an eye on a temperature monitor, such as Speedfan (freeware). Your motherboard manufacturer probably has one available as well. And it never hurts to clean out any dust collecting in the computer case. Be sure to block any fans from rotating when you blow it out, so they don't send any unfiltered power surges through the system.
"ArchiveInvalidation" (AI) is a method by which the game is told to look for "loose files" in preference to those in the vanilla BSA files. This is the reliable method to get a mod's own texture and mesh files utilized, assuming you have properly installed those "assets". This post on manual invalidation explains the problem and history quite well.
For the older games (prior to Skyrim) [Curator: Gamebryo Engine based] a BSA redirection plugin has to be installed. This can be done from settings->workarounds or from the dashboard (if you haven't removed the button already).
Please note that this will create a new mod called "Vortex Archive Invalidation". You can disable or remove that mod like any other but for invalidation to work you should keep it enabled on every profile.
If you have to isolate a mod conflict, try first "disabling" half your mods, and testing. If the problem disappears, then you know the mod conflict lies in the "disabled" half of the mods. Re-enable half of the "disabled" half of the mods (i.e. now down to 1/4 of the total) while disabling the entirety of the other (previously enabled) half, and test. Keep repeating this "halving the remainder" process until you have narrowed it down to the mod that causes the problem only when it is active. This is the quickest way to isolate a problem mod.
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