Chunk Loading error

[Djinnii]

Wondering if anyone can help me with this error:

2012-12-09 12:08:57 [sEVERE] java.lang.Exception

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.Chunk.a(Chunk.java:676)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.Chunk.a(Chunk.java:650)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:296)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:64)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:53)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.ChunkProviderServer.loadChunk(ChunkProviderServer.java:141)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:84)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:349)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:198)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:428)

2012-12-09 12:08:57 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

All I can work out is that there was an error loading a chunk or possibly a chunk loader... as to which one how why... is beyond me.