error

2013-03-03 17:20:21 [SEVERE] Exception in thread "pool-1-thread-6"
2013-03-03 17:20:21 [SEVERE] org.apache.commons.lang.UnhandledException: Plugin Craftconomy3 v3.1.2a b1072-a0a0225df9686aaf2d91876a03eb480446c686c5-master generated an exception while executing task 11021
	at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
	at java.util.ArrayList$Itr.next(ArrayList.java:791)
	at com.greatmancode.craftconomy3.converter.Converter.addAccountToString(Converter.java:147)
	at com.greatmancode.craftconomy3.converter.converters.BoseEconomy.importData(BoseEconomy.java:89)
	at com.greatmancode.craftconomy3.commands.setup.NewSetupConvertCommand$1.run(NewSetupConvertCommand.java:96)
	at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftTask.run(CraftTask.java:53)
	at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more