Xen users - Sep 2009 - "No module named xs" while I ran xm-test for Xen testing

Dear All,       I am trying the test suite named xm-test for Xen testing.       
I have finished the installation of the test suite by following its README
document.      But I got import error that can not find a module named
"xs", when I tried to run all test scripts provided by xm-test.     
The error message is presented as follows:
     Traceback (most recent call last):     ...     File
"/tmp/xen-3.4.1/tools/python/xen/xm/console.py", line 21, in ?    
from xen.lowlevel.xs  import xs     ImportError: No module named xs
      Does anyone ever have the experience about this problem?      Thanks a lot
for problem discussion and shooting.
Best regards,C. Y., Bred, Chen
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