NonInstrumentableTypeException

Hi all,I encountered the NonInstrumentableTypeException while trying to run the sample helloworld.py scripts.I searched the mailing list, it seems to be  bug that has been fixed since 3.7.Any ideas ?
Below is my debugging log.
2014-09-12 11:43:57,583 INFO   : The Grinder version 3.112014-09-12 11:43:57,590 INFO   : Java(TM) SE Runtime Environment 1.7.0_67-b01: Java HotSpot(TM) Client VM (24.65-b04, mixed mode, sharing) on Windows 7 x86 6.12014-09-12 11:43:57,592 INFO  : time zone is PDT (-0700)2014-09-12 11:43:57,795 INFO   : Java VM does not support instrumentation, DCR unavailable2014-09-12 11:43:57,870 INFO  : worker process 02014-09-12 11:43:57,904 INFO   : instrumentation agents: NO INSTRUMENTER COULD BE LOADED2014-09-12 11:44:00,813 ERROR : aborting process - Java exception initialising test scriptnet.grinder.scriptengine.jython.JythonScriptExecutionException: Java exception initialising test script	test1.record(log)	File ".\helloworld.py", line 23, in <module>net.grinder.script.NonInstrumentableTypeException: Failed to wrap <bound method net.grinder.engine.process.ExternalLogger.info of net.grinder.engine.process.ExternalLogger(worker.Q80035751-SC01-0)>	at net.grinder.engine.process.MasterInstrumenter.instrument(MasterInstrumenter.java:91) ~[grinder-core-3.11.jar:na]	at net.grinder.scriptengine.CompositeInstrumenter.instrument(CompositeInstrumenter.java:90) ~[grinder-core-3.11.jar:na]	at net.grinder.engine.process.TestData.instrument(TestData.java:113) ~[grinder-core-3.11.jar:na]	at net.grinder.script.Test.record(Test.java:113) ~[grinder-core-3.11.jar:na]	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_67]	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_67]	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_67]	at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_67]	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.PyObject.__call__(PyObject.java:404) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.PyObject.__call__(PyObject.java:408) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.PyMethod.__call__(PyMethod.java:124) ~[jython-standalone-2.5.3.jar:na]	at org.python.pycode._pyx1.f$0(.\helloworld.py:27) ~[na:na]	at org.python.pycode._pyx1.call_function(.\helloworld.py) ~[na:na]	at org.python.core.PyTableCode.call(PyTableCode.java:165) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.PyCode.call(PyCode.java:18) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.Py.runCode(Py.java:1275) ~[jython-standalone-2.5.3.jar:na]	at org.python.core.__builtin__.execfile_flags(__builtin__.java:522) ~[jython-standalone-2.5.3.jar:na]	at org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:225) ~[jython-standalone-2.5.3.jar:na]	at net.grinder.scriptengine.jython.JythonScriptEngine.<init>(JythonScriptEngine.java:129) ~[grinder-core-3.11.jar:na]	at net.grinder.scriptengine.jython.JythonScriptEngineService.createScriptEngine(JythonScriptEngineService.java:102) ~[grinder-core-3.11.jar:na]	at net.grinder.engine.process.ScriptEngineContainer.getScriptEngine(ScriptEngineContainer.java:81) ~[grinder-core-3.11.jar:na]	at net.grinder.engine.process.GrinderProcess.run(GrinderProcess.java:404) ~[grinder-core-3.11.jar:na]	at net.grinder.engine.process.WorkerProcessEntryPoint.run(WorkerProcessEntryPoint.java:86) [grinder-core-3.11.jar:na]	at net.grinder.engine.agent.IsolatedGrinderProcessRunner.run(IsolatedGrinderProcessRunner.java:53) [grinder-core-3.11.jar:na]	at net.grinder.engine.agent.DebugThreadWorker$1.run(DebugThreadWorker.java:63) [grinder-core-3.11.jar:na]2014-09-12 11:44:00,818 INFO  Q80035751-SC01-0 : communication shut down
Thanks for your help!
Qingyu

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