cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/gildedgames/util/io_manager/exceptions/IOManagerTakenException

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cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: com/gildedgames/util/io_manager/exceptions/IOManagerTakenException
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)

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