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Warning then crash

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As I was looking at my console, I found this warning before abruptly crashing. Can someone tell me what is going on and how I can fix this?


WARNING: Duplicate name in Manifest: FMLCorePluginContainsFMLMod.

Ensure that the manifest does not have duplicate entries, and

that blank lines separate individual sections in both your

manifest and in the META-INF/MANIFEST.MF entry in the jar file.


The crash part was a InvocationTargetException, Caused by net.minecraft.block.BlockGlass. Oddly enough, however, I never got a true crash report and i'm only limited to what my minecraft launcher says.


It also says something about a Duplicate method name&signature in class file net/minecraft/block/BlockGlass. I've made pretty big modpacks before, but I don't understand what this means...

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