Chronon recorder fails when stop button is pressed with following exception:

57:48,996 ERROR [STDERR] (Chronon: Client handler executor) Exception in thread "Chronon: Client handler executor"
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) java.lang.InternalError
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:124)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at com.chronon.sb.recorder.b.a(SourceFile:229)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at com.chronon.sb.recorder.b.a(SourceFile:147)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at com.chronon.sb.recorder.b.f.run(SourceFile:172)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
2012-06-19 10:57:48,996 ERROR [STDERR] (Chronon: Client handler executor) at java.lang.Thread.run(Thread.java:662)