2014-09-13 21:18:45 [ERROR] [OFC] java.util.ConcurrentModificationException
2014-09-13 21:18:45 [WARN] java.util.ConcurrentModificationException
2014-09-13 21:18:45 [WARN]      at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
2014-09-13 21:18:45 [WARN]      at java.util.ArrayList$Itr.next(ArrayList.java:831)
2014-09-13 21:18:45 [WARN]      at net.minecraft.server.v1_7_R4.World.getType(World.java:317)
2014-09-13 21:18:45 [WARN]      at net.minecraft.server.v1_7_R4.World.getType(World.java:308)
2014-09-13 21:18:45 [WARN]      at net.minecraft.server.v1_7_R4.WorldServer.getTypeId(WorldServer.java:1039)
2014-09-13 21:18:45 [WARN]      at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.getBlockTypeIdAt(CraftWorld.java:89)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.obfuscation.Calculations.areAjacentBlocksTransparent(Calculations.java:584)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.obfuscation.Calculations.areAjacentBlocksTransparent(Calculations.java:605)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.obfuscation.Calculations.areAjacentBlocksTransparent(Calculations.java:607)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.obfuscation.Calculations.Obfuscate(Calculations.java:367)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.obfuscation.Calculations.ComputeChunkInfoAndObfuscate(Calculations.java:229)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.obfuscation.Calculations.Obfuscate(Calculations.java:107)
2014-09-13 21:18:45 [WARN]      at com.lishid.orebfuscator.hook.ChunkProcessingThread.run(ChunkProcessingThread.java:106)