Stacktrace

2012-12-09 19:13:22 [SEVERE] [ForgeModLoader] A TileEntity type captainlepidus.btp.common.TileEntityOven has throw an exception trying to write state. It will not persist. Report this to the mod author
java.lang.RuntimeException: class captainlepidus.btp.common.TileEntityOven is missing a mapping! This is a bug!
	at net.minecraft.src.TileEntity.writeToNBT(TileEntity.java:97)
	at captainlepidus.btp.common.TileEntityOven.writeToNBT(TileEntityOven.java:167)
	at net.minecraft.src.AnvilChunkLoader.writeChunkToNBT(AnvilChunkLoader.java:286)
	at net.minecraft.src.AnvilChunkLoader.saveChunk(AnvilChunkLoader.java:113)
	at net.minecraft.src.ChunkProviderServer.safeSaveChunk(ChunkProviderServer.java:216)
	at net.minecraft.src.ChunkProviderServer.saveChunks(ChunkProviderServer.java:268)
	at net.minecraft.src.WorldServer.saveAllChunks(WorldServer.java:801)
	at net.minecraft.server.MinecraftServer.saveAllWorlds(MinecraftServer.java:376)
	at net.minecraft.server.MinecraftServer.stopServer(MinecraftServer.java:409)
	at net.minecraft.src.IntegratedServer.stopServer(IntegratedServer.java:218)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:539)
	at net.minecraft.src.ThreadMinecraftServer.run(ThreadMinecraftServer.java:17)
2012-12-09 19:13:23 [INFO] [ForgeModLoader] Unloading dimension 0
2012-12-09 19:13:23 [INFO] [ForgeModLoader] Unloading dimension 1
2012-12-09 19:13:23 [INFO] [STDERR] java.lang.NullPointerException
2012-12-09 19:13:23 [INFO] [STDERR] 	at cpw.mods.fml.common.network.NetworkRegistry.openLocalGui(NetworkRegistry.java:322)
2012-12-09 19:13:23 [INFO] [STDERR] 	at cpw.mods.fml.common.network.FMLNetworkHandler.openGui(FMLNetworkHandler.java:341)
2012-12-09 19:13:23 [INFO] [STDERR] 	at net.minecraft.src.EntityPlayer.openGui(EntityPlayer.java:2204)
2012-12-09 19:13:23 [INFO] [STDERR] 	at captainlepidus.btp.common.BlockOven.onBlockActivated(BlockOven.java:39)
2012-12-09 19:13:23 [INFO] [STDERR] 	at net.minecraft.src.PlayerControllerMP.onPlayerRightClick(PlayerControllerMP.java:337)
2012-12-09 19:13:23 [INFO] [STDERR] 	at net.minecraft.client.Minecraft.clickMouse(Minecraft.java:1333)
2012-12-09 19:13:23 [INFO] [STDERR] 	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1814)
2012-12-09 19:13:23 [INFO] [STDERR] 	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:858)
2012-12-09 19:13:23 [INFO] [STDERR] 	at net.minecraft.client.Minecraft.run(Minecraft.java:783)
2012-12-09 19:13:23 [INFO] [STDERR] 	at java.lang.Thread.run(Unknown Source)