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Got this message when trying to open the Agrarian Skies modpack for the first time:
2014-08-19 19:04:37 [INFO] [STDERR] Exception in thread "main" java.lang.NoClassDefFoundError: cpw/mods/fml/common/DummyModContainer
2014-08-19 19:04:37 [INFO] [STDERR] at...
