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my minecraft crashes when i try openning it, someone that knows more about mods than me can help me out?


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this is the error im getting when trying to open minecraft (also i use sklauncher to play minecraft bc on brazil minecraft is too expensive, don't know if this changes the code or something)

[20:38:48] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:38:48] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[20:38:48] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[20:38:48] [main/INFO] [FML]: Forge Mod Loader version for Minecraft 1.12.2 loading
[20:38:48] [main/INFO] [FML]: Java is Java HotSpot(TM) Client VM, version 1.8.0_261, running on Windows 10:x86:10.0, installed at C:\Program Files (x86)\Java\jre1.8.0_261
[20:38:50] [main/INFO] [FML]: Searching C:\Users\mylit\AppData\Roaming\.minecraft\mods for mods
[20:38:50] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in BetterFoliage-MC1.12-2.3.1.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:38:50] [main/WARN] [FML]: The coremod BetterFoliageLoader (mods.betterfoliage.loader.BetterFoliageLoader) is not signed!
[20:38:50] [main/INFO] [FML]: Loading tweaker guichaguri.betterfps.tweaker.BetterFpsTweaker from BetterFps-1.4.8.jar
[20:38:50] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in iceandfire-1.9.1-1.12.2.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:38:50] [main/WARN] [FML]: The coremod iceandfire (com.github.alexthe666.iceandfire.asm.IceAndFirePlugin) is not signed!
[20:38:50] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.12.2_HD_U_F5.jar
[20:38:50] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in Quark-r1.6-179.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:38:50] [main/WARN] [FML]: The coremod Quark Plugin (vazkii.quark.base.asm.LoadingPlugin) is not signed!
[20:38:50] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in SereneSeasons-1.12.2-1.2.18-universal.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[20:38:50] [main/WARN] [FML]: The coremod sereneseasons.asm.SSLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[20:38:50] [main/WARN] [FML]: The coremod SSLoadingPlugin (sereneseasons.asm.SSLoadingPlugin) is not signed!
[20:38:50] [main/INFO] [FML]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from Surge-1.12.2-2.0.79.jar
[20:38:50] [main/INFO] [FML]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from VanillaFix-1.0.10-99.jar
[20:38:50] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:38:50] [main/INFO] [LaunchWrapper]: Loading tweak class name guichaguri.betterfps.tweaker.BetterFpsTweaker
[20:38:50] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFineForgeTweaker
[20:38:50] [main/INFO] [LaunchWrapper]: Loading tweak class name org.spongepowered.asm.launch.MixinTweaker
[20:38:50] [main/INFO] [mixin]: SpongePowered MIXIN Subsystem Version=0.8 Source=file:/C:/Users/mylit/AppData/Roaming/.minecraft/mods/Surge-1.12.2-2.0.79.jar Service=LaunchWrapper Env=CLIENT
[20:38:51] [main/INFO] [mixin]: Compatibility level set to JAVA_8
[20:38:51] [main/INFO] [VanillaFix]: Initializing VanillaFix
[20:38:51] [main/INFO] [VanillaFix]: Initializing StacktraceDeobfuscator
[20:38:51] [main/INFO] [VanillaFix]: Found MCP method mappings: methods-stable_39.csv
[20:38:51] [main/INFO] [VanillaFix]: Done initializing StacktraceDeobfuscator
[20:38:51] [main/INFO] [VanillaFix]: Initializing Bug Fix Mixins
[20:38:51] [main/INFO] [VanillaFix]: Initializing Crash Fix Mixins
[20:38:51] [main/INFO] [VanillaFix]: Initializing Profiler Improvement Mixins
[20:38:51] [main/INFO] [VanillaFix]: Initializing Texture Fix Mixins
[20:38:51] [main/INFO] [VanillaFix]: Initializing Mod Support Mixins
[20:38:51] [main/WARN] [FML]: The coremod VanillaFixLoadingPlugin (org.dimdev.vanillafix.VanillaFixLoadingPlugin) is not signed!
[20:38:51] [main/WARN] [LaunchWrapper]: Tweak class name org.spongepowered.asm.launch.MixinTweaker has already been visited -- skipping
[20:38:51] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[20:38:51] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:38:51] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[20:38:51] [main/INFO] [LaunchWrapper]: Calling tweak class optifine.OptiFineForgeTweaker
[20:38:51] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: acceptOptions
[20:38:51] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: injectIntoClassLoader
[20:38:51] [main/INFO] [STDOUT]: [optifine.OptiFineClassTransformer:dbg:242]: OptiFine ClassTransformer
[20:38:51] [main/INFO] [STDOUT]: [optifine.OptiFineClassTransformer:dbg:242]: OptiFine ZIP file: C:\Users\mylit\AppData\Roaming\.minecraft\mods\OptiFine_1.12.2_HD_U_F5.jar
[20:38:51] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:38:55] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[20:38:55] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[20:38:55] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:38:55] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:38:55] [main/INFO] [LaunchWrapper]: Calling tweak class org.spongepowered.asm.launch.MixinTweaker
[20:38:55] [main/INFO] [mixin]: Initialised Mixin FML Remapper Adapter with net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper@13fe06e
[20:38:55] [main/INFO] [LaunchWrapper]: Calling tweak class guichaguri.betterfps.tweaker.BetterFpsTweaker
[20:38:55] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[20:38:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[20:38:56] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
Exception in thread "main" [20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: java.lang.NoClassDefFoundError: com/github/alexthe666/iceandfire/patcher/IceAndFireRuntimePatcher
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at com.github.alexthe666.iceandfire.asm.IceAndFirePlugin.getASMTransformerClass(IceAndFirePlugin.java:18)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:129)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]: Caused by: java.lang.ClassNotFoundException: com.github.alexthe666.iceandfire.patcher.IceAndFireRuntimePatcher
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at java.lang.ClassLoader.loadClass(Unknown Source)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     at java.lang.ClassLoader.loadClass(Unknown Source)
[20:38:56] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:-1]:     ... 4 more
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: Caused by: java.lang.NoClassDefFoundError: net/ilexiconn/llibrary/server/asm/RuntimePatcher
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at java.lang.ClassLoader.defineClass1(Native Method)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at java.lang.ClassLoader.defineClass(Unknown Source)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at java.security.SecureClassLoader.defineClass(Unknown Source)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     ... 6 more
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]: Caused by: java.lang.ClassNotFoundException: net.ilexiconn.llibrary.server.asm.RuntimePatcher
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at java.lang.ClassLoader.loadClass(Unknown Source)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     at java.lang.ClassLoader.loadClass(Unknown Source)
[20:38:56] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:-1]:     ... 10 more

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1.12 is no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.


As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.


For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.


Logs (Most issues require logs to diagnose):


Please post logs using one of the following sites (Thank you Lumber Wizard for the list):

https://gist.github.com/100MB Requires member (Free)

https://pastebin.com/: 512KB as guest, 10MB as Pro ($$$)

https://hastebin.com/: 400KB

Do NOT use sites like Mediafire, Dropbox, OneDrive, Google Drive, or a site that has a countdown before offering downloads.


What to provide:

...for Crashes and Runtime issues:

Minecraft 1.14.4 and newer:

Post debug.log

Older versions:

Please update...


...for Installer Issues:

Post your installer log, found in the same place you ran the installer

This log will be called either installer.log or named the same as the installer but with .log on the end

Note for Windows users:

Windows hides file extensions by default so the installer may appear without the .jar extension then when the .log is added the log will appear with the .jar extension


Where to get it:

Mojang Launcher: When using the Mojang launcher debug.log is found in .minecraft\logs.


Curse/Overwolf: If you are using the Curse Launcher, their configurations break Forge's log settings, fortunately there is an easier workaround than I originally thought, this works even with Curse's installation of the Minecraft launcher as long as it is not launched THROUGH Twitch:

  1. Make sure you have the correct version of Forge installed (some packs are heavily dependent on one specific build of Forge)
  2. Make a launcher profile targeting this version of Forge.
  3. Set the launcher profile's GameDir property to the pack's instance folder (not the instances folder, the folder that has the pack's name on it).
  4. Now launch the pack through that profile and follow the "Mojang Launcher" instructions above.






or alternately, 


Fallback ("No logs are generated"):

If you don't see logs generated in the usual place, provide the launcher_log.txt from .minecraft


Server Not Starting:


If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.


Reporting Illegal/Inappropriate Adfocus Ads:


Get a screenshot of the URL bar or copy/paste the whole URL into a thread on the General Discussion board with a description of the Ad.

Lex will need the Ad ID contained in that URL to report it to Adfocus' support team.


Posting your mod as a GitHub Repo:


When you have an issue with your mod the most helpful thing you can do when asking for help is to provide your code to those helping you. The most convenient way to do this is via GitHub or another source control hub.

When setting up a GitHub Repo it might seem easy to just upload everything, however this method has the potential for mistakes that could lead to trouble later on, it is recommended to use a Git client or to get comfortable with the Git command line. The following instructions will use the Git Command Line and as such they assume you already have it installed and that you have created a repository.


  1. Open a command prompt (CMD, Powershell, Terminal, etc).
  2. Navigate to the folder you extracted Forge’s MDK to (the one that had all the licenses in).
  3. Run the following commands:
    1. git init
    2. git remote add origin [Your Repository's URL]
      • In the case of GitHub it should look like: https://GitHub.com/[Your Username]/[Repo Name].git
    3. git fetch
    4. git checkout --track origin/master
    5. git stage *
    6. git commit -m "[Your commit message]"
    7. git push
  4. Navigate to GitHub and you should now see most of the files.
    • note that it is intentional that some are not synced with GitHub and this is done with the (hidden) .gitignore file that Forge’s MDK has provided (hence the strictness on which folder git init is run from)
  5. Now you can share your GitHub link with those who you are asking for help.

[Workaround line, please ignore]


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