c# - IronPython - Error in URL request

Question

When using IronPython I make a URL request to get an XML (with python-requests), in the VisualStudio's console I get the following error:

failed to parse CPython sys.version: '2.7.3 ()'

What does this mean? How can i fix it?

This is the Python code that causes the problem:

def __xml_retrieve(self, query_string):
    """ Handles MB speed limits """
    attempt = 0
    while attempt <= self.max_attempts:
        attempt += 1
        # raises connectionerror; still not managed
        try:                
            r = requests.get(query_string)
        except Exception as exc:
            print exc.message 
        if r.status_code == 503:
            time.sleep(self.speed_limit_pause)
        elif r.status_code == 200:
            return r.content
    return

The problem born when I call request.get(query_string). This is the requests library: http://docs.python-requests.org/en/latest/.