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Every time I try to load up my world the game crashes and says minecraft has encountered an error. It ONLY crashes on my survival world and if I make a new one it's ok.
java.lang.IndexOutOfBoundsException
at com.eloraam.redpower.core.ItemExtended.d(ItemExtended.java:33)
Something went wrong with extending.
The only solution i can think of atm is to remove the faulty block with MCEdit.
Make sure you make a backup off your world before loading it in any external program.