2013-09-25 18:42:03 [SEVERE] [ForgeModLoader] A TileEntity type com.tterrag.simpleTransmutations.tile.TileInvisibleRedstone has throw an exception trying to write state. It will not persist. Report this to the mod author
java.lang.RuntimeException: class com.tterrag.simpleTransmutations.tile.TileInvisibleRedstone is missing a mapping! This is a bug!
	at net.minecraft.tileentity.TileEntity.writeToNBT(TileEntity.java:108)
	at com.tterrag.simpleTransmutations.tile.TileInvisibleRedstone.writeToNBT(TileInvisibleRedstone.java:38)
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.writeChunkToNBT(AnvilChunkLoader.java:317)
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.saveChunk(AnvilChunkLoader.java:127)
	at net.minecraft.world.gen.ChunkProviderServer.safeSaveChunk(ChunkProviderServer.java:232)
	at net.minecraft.world.gen.ChunkProviderServer.saveChunks(ChunkProviderServer.java:284)
	at net.minecraft.world.WorldServer.saveAllChunks(WorldServer.java:901)
	at net.minecraft.server.MinecraftServer.saveAllWorlds(MinecraftServer.java:358)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:591)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:129)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)