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    Crash when installing Ars Magica in the Mindcrack Pack!

    I got this error message when installing AM: ---- Minecraft Crash Report ---- // Don't be sad, have a hug! <3 Time: 05.05.13 20:41 Description: Failed to start game java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(Unknown Source) at...