it gives me a crash log saying "exit code 0"

it keeps opening this:
15:49:16.999
Patcher expecting non-empty class data file for net.minecraft.entity.passive.EntityOcelot, but received empty.
15:49:16.999
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$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:169) at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Caused by: java.lang.RuntimeException: Patcher expecting non-empty class data file for net.minecraft.entity.passive.EntityOcelot, but received empty, your vanilla jar may be corrupt. at net.minecraftforge.fml.common.patcher.ClassPatchManager.applyPatch(ClassPatchManager.java:114) at net.minecraftforge.fml.common.patcher.ClassPatchManager.getPatchedResource(ClassPatchManager.java:77) at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.getFieldType(FMLDeobfuscatingRemapper.java:219) at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.parseField(FMLDeobfuscatingRemapper.java:192) at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.setup(FMLDeobfuscatingRemapper.java:161) at net.minecraftforge.fml.common.asm.FMLSanityChecker.injectData(FMLSanityChecker.java:187) at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:164) ... 2 more
15:49:17.009
[java.lang.ThreadGroup:uncaughtException:1052]: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
15:49:17.009
[java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
15:49:17.009
[java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.SecurityManager.checkExit(SecurityManager.java:761)
15:49:17.009
[java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.Runtime.exit(Runtime.java:107)
15:49:17.009
[java.lang.ThreadGroup:uncaughtException:1052]: at java.lang.System.exit(System.java:971)
15:49:17.010
[java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
15:49:17.010
[java.lang.ThreadGroup:uncaughtException:1052]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
15:49:17.060
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0
15:49:17.060
Process crashed with exit code 1