[14:56:14] [Server thread/INFO] [STDOUT]: [com.arucraft.tileentity.TileEntityAlloyOven:writeToNBT:74]: [Lnet.minecraft.item.ItemStack;@6b901e61
[14:56:14] [Server thread/ERROR] [FML]: A TileEntity type com.arucraft.tileentity.TileEntityAlloyOven has throw an exception trying to write state. It will not persist. Report this to the mod author
java.lang.RuntimeException: class com.arucraft.tileentity.TileEntityAlloyOven is missing a mapping! This is a bug!
	at net.minecraft.tileentity.TileEntity.writeToNBT(TileEntity.java:96) ~[TileEntity.class:?]
	at com.arucraft.tileentity.TileEntityAlloyOven.writeToNBT(TileEntityAlloyOven.java:75) ~[TileEntityAlloyOven.class:?]
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.writeChunkToNBT(AnvilChunkLoader.java:395) [AnvilChunkLoader.class:?]
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.saveChunk(AnvilChunkLoader.java:204) [AnvilChunkLoader.class:?]
	at net.minecraft.world.gen.ChunkProviderServer.safeSaveChunk(ChunkProviderServer.java:287) [ChunkProviderServer.class:?]
	at net.minecraft.world.gen.ChunkProviderServer.saveChunks(ChunkProviderServer.java:340) [ChunkProviderServer.class:?]
	at net.minecraft.world.WorldServer.saveAllChunks(WorldServer.java:862) [WorldServer.class:?]
	at net.minecraft.server.MinecraftServer.saveAllWorlds(MinecraftServer.java:370) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.stopServer(MinecraftServer.java:405) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.stopServer(IntegratedServer.java:266) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:538) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]