For some reason 1.7.10 forge crashes with exit code 1. All versions of it. However, all Vanilla versions of Minecraft, as well as every other version of Forge works just fine, from 1.8 to 1.12.

Here's the log.

[07:43:04] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[07:43:04] [main/INFO]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[07:43:04] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[07:43:04] [main/INFO]: Forge Mod Loader version 7.99.39.1566 for Minecraft 1.7.10 loading
[07:43:04] [main/INFO]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_51
[07:43:04] [main/WARN]: The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/WARN]: The coremod net.labymod.core.asm.LabyModCoreMod does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/ERROR]: Coremod LabyModCoreMod: The plugin net.labymod.core.asm.LabyModCoreMod is not an implementor of IFMLLoadingPlugin
java.lang.ClassCastException: net.labymod.core.asm.LabyModCoreMod cannot be cast to cpw.mods.fml.relauncher.IFMLLoadingPlugin
    at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:501) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1566-1.7.10.jar:?]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
[07:43:05] [main/WARN]: The coremod net.malisis.core.asm.MalisisCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/WARN]: The coremod mods.battlegear2.coremod.BattlegearLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/WARN]: The coremod mcp.mobius.mobiuscore.asm.CoreDescription does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/WARN]: The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/INFO]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine.jar
[07:43:05] [main/INFO]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.7.10_HD_U_D6.jar
[07:43:05] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[07:43:05] [main/INFO]: Loading tweak class name optifine.OptiFineForgeTweaker
[07:43:05] [main/WARN]: Tweak class name optifine.OptiFineForgeTweaker has already been visited -- skipping
[07:43:05] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[07:43:05] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[07:43:05] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[07:43:05] [main/INFO]: Calling tweak class optifine.OptiFineForgeTweaker
[07:43:05] [main/INFO]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: acceptOptions
[07:43:05] [main/INFO]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: injectIntoClassLoader
[07:43:05] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:225]: file:/C:/Users/seanl/AppData/Roaming/.minecraft/mods/OptiFine.jar
[07:43:05] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:225]: URI: file:/C:/Users/seanl/AppData/Roaming/.minecraft/mods/OptiFine.jar
[07:43:05] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:225]: /C:/Users/seanl/AppData/Roaming/.minecraft/mods/OptiFine.jar
[07:43:05] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:225]: OptiFine ClassTransformer
[07:43:05] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:225]: OptiFine URL: file:/C:/Users/seanl/AppData/Roaming/.minecraft/mods/OptiFine.jar
[07:43:05] [main/INFO]: [optifine.OptiFineClassTransformer:dbg:225]: OptiFine ZIP file: C:\Users\seanl\AppData\Roaming\.minecraft\mods\OptiFine.jar
[07:43:05] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[07:43:06] [main/INFO]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Hook registered for net.minecraft.client.Minecraft
[07:43:06] [main/INFO]: Hook registered for net.minecraft.client.multiplayer.PlayerControllerMP
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[07:43:06] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.TerminalTweaker
[07:43:06] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.TerminalTweaker
[07:43:06] [main/INFO]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: getLaunchArguments
[07:43:06] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[07:43:06] [main/INFO]: Found hooks for net.minecraft.client.Minecraft (bao)
[07:43:06] [main/INFO]: M&B - Patching Class Minecraft (bao)
[07:43:06] [main/INFO]:     Patching method Click Mouse in Minecraft
[07:43:06] [main/INFO]: M&B - Patching Class Minecraft done
[07:43:06] [main/ERROR]: Unable to launch
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
    at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_51]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_51]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_51]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
    ... 6 more
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]: cpw.mods.fml.relauncher.FMLSecurityManager$ExitTrappedException
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]:     at cpw.mods.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:25)
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]:     at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]:     at java.lang.Runtime.exit(Runtime.java:107)
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]:     at java.lang.System.exit(System.java:971)
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[07:43:06] [main/INFO]: [java.lang.Throwable$WrappedPrintStream:println:748]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

 

The "latest" file was the only log created. The crash occurs within 2 seconds of starting my game. Therefore I have no crash report logged or fml logs. I've updated all my drivers, as was recommended to others, so this is not the issue.

This forum is filled with 1.7 and 1.8 haters, so don't ask for help here.

 

 

42 minutes ago, Widiwow said:

[07:43:04] [main/WARN]: The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/WARN]: The coremod net.labymod.core.asm.LabyModCoreMod does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[07:43:05] [main/ERROR]: Coremod LabyModCoreMod: The plugin net.labymod.core.asm.LabyModCoreMod is not an implementor of IFMLLoadingPlugin
java.lang.ClassCastException: net.labymod.core.asm.LabyModCoreMod cannot be cast to cpw.mods.fml.relauncher.IFMLLoadingPlugin

Read this, lmao.

 

Something's wrong with your "CodeChickenLib" and "LabyMod" plugin. 

Oh god. I installed LabyMod for 1.12 using the LabyMod launcher. Looks like it's trying to load itself in all versions of Forge for whatever reason. That's why this suddenly started now. Thanks for the help.