could some one please help me on the issue below, i am using the vcloud director 5.5

[xxxxxx@localhost newVapp]$ python newVApp.py

base_url:https://10.10.51.8/api/v1.0

Traceback (most recent call last):

  File "newVApp.py", line 37, in <module>

    resp = urllib2.urlopen(base_url + '/login')

  File "/usr/local/lib/python2.7/urllib2.py", line 126, in urlopen

    return _opener.open(url, data, timeout)

  File "/usr/local/lib/python2.7/urllib2.py", line 397, in open

    response = meth(req, response)

  File "/usr/local/lib/python2.7/urllib2.py", line 510, in http_response

    'http', request, response, code, msg, hdrs)

  File "/usr/local/lib/python2.7/urllib2.py", line 435, in error

    return self._call_chain(*args)

  File "/usr/local/lib/python2.7/urllib2.py", line 369, in _call_chain

    result = func(*args)

  File "/usr/local/lib/python2.7/urllib2.py", line 518, in http_error_default

    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

urllib2.HTTPError: HTTP Error 406: Not Acceptable