Thaumcraft Aura Nodes...uh what?

[Cira]

Mindcrack server package
On startup this morning I received this error:

2013-04-07 10:03:00 [INFO] [STDERR] java.util.ConcurrentModificationException
2013-04-07 10:03:00 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
2013-04-07 10:03:00 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:922)
2013-04-07 10:03:00 [INFO] [STDERR]    at bq.a(SourceFile:24)
2013-04-07 10:03:00 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-04-07 10:03:00 [INFO] [STDERR]    at ca.a(CompressedStreamTools.java:140)
2013-04-07 10:03:00 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:198)
2013-04-07 10:03:00 [INFO] [STDERR]    at aam.c(AnvilChunkLoader.java:184)
2013-04-07 10:03:00 [INFO] [STDERR]    at aiw.b(SourceFile:29)
2013-04-07 10:03:00 [INFO] [STDERR]    at aiw.run(SourceFile:22)
2013-04-07 10:03:00 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:722)
2013-04-07 10:03:00 [INFO] [ForgeModLoader] [Thaumcraft] Removed -16 aura nodes when world 7 unloaded.
2013-04-07 10:03:01 [INFO] [ForgeModLoader] Unloading dimension 7
2013-04-07 10:03:01 [INFO] [ForgeModLoader] [Thaumcraft] Removed -16 aura nodes when world 1 unloaded.
2013-04-07 10:03:01 [INFO] [ForgeModLoader] Unloading dimension

No idea what it is or what it means. Only my son and I play on this server, and we are not even at a point where we use thaumcraft. (Still building a house, farm, and trying to mine to Redstone level)

The only thing that has changed on the server was that I installed TreeCapitator (please see the tree cap thread here).

so what does this error mean and how do I go about fixing it?

 

[budge]

I think this is normal behavior. It just means that Thaumcraft is unloading aura nodes that are no longer in use. I see it all the time.

Edit: Not sure what the concurrent modification exception is, but I also see that one all the time. I don't think it's related to the aura nodes.

 

[Bickers]

i get this alot to it dont seem to cause any problems for me it seems to reappear every 20mins or so