error when use libgmail with proxy

[马不停蹄的猪]

Hi all,
Does anybody use libgmail with proxy?  I met error here.

Below is code snip:

        libgmail.PROXY_URL = G_PROXY # the proxy url
        self.ga = libgmail.GmailAccount(account,pwd)
        self.ga.login()

Error information:
          ga.login
()
File "C:\Python25\Lib\site-packages\libgmail.py", line 305, in
login
         pageData = self._retrievePage
(req)
File "C:\Python25\Lib\site-packages\libgmail.py", line 348, in
_retrievePage
           resp = self.opener.open
(req)
File "build\bdist.win32\egg\mechanize\_opener.py", line 191, in
open
File "C:\Python25\lib\urllib2.py", line 399, in
_open
        '_open',
req)
File "C:\Python25\lib\urllib2.py", line 360, in
_call_chain
        result = func
(*args)
File "build\bdist.win32\egg\mechanize\_http.py", line 751, in
https_open
AttributeError: 'int' object has no attribute
'find_key_cert'

Is it possible the issue of mechanize?