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java.lang.NullPointerException: 	at mekanism.common.block.BlockMachine.isSideSolid(	at net.minecraft.block.Block.canCreatureSpawn(	at sun.reflect.GeneratedMethodAccessor36.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at Reflector.callBoolean(	at	at	at	at WorldServerOF.func_72835_b(	at net.minecraft.server.MinecraftServer.func_71190_q(	at net.minecraft.server.MinecraftServer.func_71217_p(	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(	at	at net.minecraft.server.MinecraftServer$