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Hello! I am having issues with running 1.12.2, in that it won't run. It'll go through the launcher normally, but once it comes to actually launching the game, it does...nothing. I'll post the Log here to help out with the issue; Thank you in advance!

[10:16:39] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[10:16:39] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[10:16:39] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[10:16:39] [main/INFO] [FML]: Forge Mod Loader version 14.23.5.2859 for Minecraft 1.12.2 loading
[10:16:39] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Users\Michael Rowe\curseforge\minecraft\Install\runtime\jre-legacy\windows-x64\jre-legacy
[10:16:39] [main/INFO] [FML]: Searching C:\Users\Michael Rowe\curseforge\minecraft\Instances\MinaCraftu\mods for mods
[10:16:39] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:16:39] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[10:16:39] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:16:39] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:16:39] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[10:16:41] [main/FATAL] [FML]: Patcher expecting non-empty class data file for net.minecraft.entity.passive.EntityOcelot, but received empty.
[10:16:41] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.RuntimeException: java.lang.RuntimeException: Patcher expecting non-empty class data file for net.minecraft.entity.passive.EntityOcelot, but received empty, your vanilla jar may be corrupt.
    at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:169) ~[forge-1.12.2-14.23.5.2859.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:?]
Caused by: java.lang.RuntimeException: Patcher expecting non-empty class data file for net.minecraft.entity.passive.EntityOcelot, but received empty, your vanilla jar may be corrupt.
    at net.minecraftforge.fml.common.patcher.ClassPatchManager.applyPatch(ClassPatchManager.java:114) ~[forge-1.12.2-14.23.5.2859.jar:?]
    at net.minecraftforge.fml.common.patcher.ClassPatchManager.getPatchedResource(ClassPatchManager.java:77) ~[forge-1.12.2-14.23.5.2859.jar:?]
    at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.getFieldType(FMLDeobfuscatingRemapper.java:219) ~[forge-1.12.2-14.23.5.2859.jar:?]
    at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.parseField(FMLDeobfuscatingRemapper.java:192) ~[forge-1.12.2-14.23.5.2859.jar:?]
    at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.setup(FMLDeobfuscatingRemapper.java:161) ~[forge-1.12.2-14.23.5.2859.jar:?]
    at net.minecraftforge.fml.common.asm.FMLSanityChecker.injectData(FMLSanityChecker.java:187) ~[forge-1.12.2-14.23.5.2859.jar:?]
    at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:164) ~[forge-1.12.2-14.23.5.2859.jar:?]
    ... 2 more
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.Runtime.exit(Runtime.java:107)
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.System.exit(System.java:971)
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[10:16:41] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

The version you are using is no longer supported on this forum.

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

Currently supported versions are 1.19.2 (Latest) and 1.18.2 (LTS).

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