Chunk (-7, -10) stored at (-15, -9)

2011-06-15 00:45:42 [INFO] Chunk (-7, -10) stored at (-15, -9)
2011-06-15 00:45:42 [SEVERE] java.lang.Throwable
2011-06-15 00:45:42 [SEVERE] at org.bukkit.craftbukkit.util.LongHashtable.get(LongHashtable.java:32)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProviderServer.java:115)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.World.getChunkAt(World.java:252)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.World.j(World.java:1768)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.World.doTick(World.java:1617)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:389)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:309)
2011-06-15 00:45:42 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)


Now, I have no clue what this means. But I'm guessing that it is.. chunk corruption? I have no clue. :S
Can someone please help me on figuring out at least WHAT this means and HOW I can fix it (if I can)?

EDIT: I reloaded a backup to 2 days ago, and even though NOTHING changed at all in that area where it spams it, it stopped.

 

look for the tool chunkster, I think its in bukkit tools and run it. it solves this map corruption

 

http://forums.bukkit.org/threads/tutorial-reducing-lag-and-possibly-fixing-corrupt-worlds.20911/