java.lang.NullPointerException
at ic2.advancedmachines.common.TileEntityAdvancedMachine.operate(TileEntityAdvancedMachine.java:211)
at ic2.advancedmachines.common.TileEntityAdvancedMachine.g(TileEntityAdvancedMachine.java:96)
at xe.h(World.java:2020)
at ie.h(WorldServer.java:463)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:649)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:585)
at bcb.q(IntegratedServer.java:110)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:492)
at fp.run(SourceFile:818)
--- END ERROR REPORT a0f5498e ----------
save unloadable. happened on 4.4b so I upgraded to 4,4c and same thing happened