bugzilla access by client

I have installed the bugzilla in one virtual machine and another virtual machine i just executed bugz command to store the comment on appropriate bug in bugzilla.

      bugz -b "http://10.10.10.2/bugzilla/xmlrpc.cgi" -u "*****@gmail.com" -p "*****" modify 1 -c "edited"

After executed this command I got errors:

  * Using http://10.192.1.142/bugzilla/xmlrpc.cgi 
   Traceback (most recent call last):
    File "/usr/bin/bugz", line 393, in <module>
      main()
    File "/usr/bin/bugz", line 368, in main
      args.func(bugz, **cmd_kwds)
    File "/usr/lib/python2.7/dist-packages/bugz/cli.py", line 537, in modify
      result = Bugz.modify(self, bugid, **kwds)
    File "/usr/lib/python2.7/dist-packages/bugz/bugzilla.py", line 529, in modify
      self.auth()
    File "/usr/lib/python2.7/dist-packages/bugz/bugzilla.py", line 240, in auth
       resp = self.opener.open(req)
    File "/usr/lib/python2.7/urllib2.py", line 406, in open
       response = meth(req, response)
    File "/usr/lib/python2.7/urllib2.py", line 519, in http_response
       'http', request, response, code, msg, hdrs)
    File "/usr/lib/python2.7/urllib2.py", line 444, in error
        return self._call_chain(*args)
    File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
        result = func(*args)
    File "/usr/lib/python2.7/urllib2.py", line 527, in http_error_default
        raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
    urllib2.HTTPError: HTTP Error 500: Internal Server Error

Thanks in Advance