SOAP API "'A recursive query has encountered an infinite loop condition'' issue

SOAPAPI TestRun_CreateFromTestSet() is working for me until today, Suddenly, I got this error,"'A recursive query has encountered an infinite loop condition'.  I don't know why. Any idea?

>>> test=client.service.TestRun_CreateFromTestSet(104)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\apps\Python27\lib\site-packages\suds-0.4-py2.7.egg\suds\client.py", l
ine 542, in __call__
    return client.invoke(args, kwargs)
  File "C:\apps\Python27\lib\site-packages\suds-0.4-py2.7.egg\suds\client.py", l
ine 602, in invoke
    result = self.send(soapenv)
  File "C:\apps\Python27\lib\site-packages\suds-0.4-py2.7.egg\suds\client.py", l
ine 649, in send
    result = self.failed(binding, e)
  File "C:\apps\Python27\lib\site-packages\suds-0.4-py2.7.egg\suds\client.py", l
ine 702, in failed
    r, p = binding.get_fault(reply)
  File "C:\apps\Python27\lib\site-packages\suds-0.4-py2.7.egg\suds\bindings\bind
ing.py", line 265, in get_fault
    raise WebFault(p, faultroot)
suds.WebFault: Server raised fault: 'A recursive query has encountered an infini
te loop condition'