chicken core bug

[16:19:25] [Server thread/ERROR] [FML]: A TileEntity type codechicken.multipart.
handler.MultipartSaveLoad$TileNBTContainer has throw an exception trying to writ
e state. It will not persist. Report this to the mod author
java.lang.RuntimeException: class codechicken.multipart.handler.MultipartSaveLoa
d$TileNBTContainer is missing a mapping! This is a bug!
        at net.minecraft.tileentity.TileEntity.func_145841_b(TileEntity.java:80)
 ~[aor.class:?]
        at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(Anvil
ChunkLoader.java:370) [aqk.class:?]
        at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(Anvil
ChunkLoader.java:197) [aqk.class:?]
        at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProvide
rServer.java:256) [ms.class:?]
        at net.minecraft.world.gen.ChunkProviderServer.func_73151_a(ChunkProvide
rServer.java:302) [ms.class:?]
        at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:809) [m
t.class:?]
        at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.jav
a:318) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.jav
a:569) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [M
inecraftServer.class:?]
        at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
[li.class:?]