Bug java.lang.UnsupportedOperationException

java.lang.UnsupportedOperationException: Only a Thread within a bot's ThreadGroup may eavesdrop on the game client. Current Thread=Thread[pool-6-thread-1,5,[t-g]3796 - Old Bot]
at nul.iIiIIIiiIIIII.null(kpc:129)
at nul.iiiIiIiiiiIII.null(noc:42)
at nul.iiiIiIiiiiIII.null(noc:121)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

I have only started some threads on the Bot Platform.sometimes not always the bot stop with this Exception after it run for a while .

does someone knows the reasons of this Exception ,thanks a million...