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java.lang.NullPointerException: 	at mekanism.common.block.BlockMachine.isSideSolid(BlockMachine.java:1154)	at net.minecraft.block.Block.canCreatureSpawn(Block.java:1533)	at sun.reflect.GeneratedMethodAccessor36.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at Reflector.callBoolean(Reflector.java:391)	at net.minecraft.world.SpawnerAnimals.func_77190_a(SpawnerAnimals.java:318)	at net.minecraft.world.SpawnerAnimals.func_77192_a(SpawnerAnimals.java:178)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:161)	at WorldServerOF.func_72835_b(WorldServerOF.java:234)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:625)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)