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Minecraft won't decompile


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I am attempting to decompile Minecraft 1.4.2. I have a clean .jar file and the lates version of MCP. After putting everything in place, I run install.cmd. Not too long after, I encounter this error:


Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 3, Size: 2

        at java.util.ArrayList.rangeCheckForAdd(ArrayList.java:612)

        at java.util.ArrayList.add(ArrayList.java:426)

        at cpw.mods.fml.common.asm.transformers.MCPMerger.processFields(MCPMerger.java:468)

        at cpw.mods.fml.common.asm.transformers.MCPMerger.processClass(MCPMerger.java:384)

        at cpw.mods.fml.common.asm.transformers.MCPMerger.processJar(MCPMerger.java:217)

        at cpw.mods.fml.common.asm.transformers.MCPMerger.main(MCPMerger.java:107)

Decompile Exception: 1

Press any key to continue . . .


I have never seen this error before, and I know everything is up to date. How do I solve this?

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