lib cloud token

Traceback (most recent call last):
  File "./gce.py", line 508, in <module>
    GceInventory()
  File "./gce.py", line 170, in __init__
    self.driver = self.get_gce_driver()
  File "./gce.py", line 318, in get_gce_driver
    gce = get_driver(Provider.GCE)(*args, **kwargs)
  File "/Library/Python/2.7/site-packages/libcloud/compute/drivers/gce.py", line 1801, in __init__
    self.zone_list = self.ex_list_zones()
  File "/Library/Python/2.7/site-packages/libcloud/compute/drivers/gce.py", line 2755, in ex_list_zones
    response = self.connection.request(request, method='GET').object
  File "/Library/Python/2.7/site-packages/libcloud/compute/drivers/gce.py", line 121, in request
    response = super(GCEConnection, self).request(*args, **kwargs)
  File "/Library/Python/2.7/site-packages/libcloud/common/google.py", line 808, in request
    *args, **kwargs)
  File "/Library/Python/2.7/site-packages/libcloud/common/base.py", line 567, in request
    params, headers = self.pre_connect_hook(params, headers)
  File "/Library/Python/2.7/site-packages/libcloud/compute/drivers/gce.py", line 110, in pre_connect_hook
    headers)
  File "/Library/Python/2.7/site-packages/libcloud/common/google.py", line 790, in pre_connect_hook
    self.oauth2_credential.access_token)
  File "/Library/Python/2.7/site-packages/libcloud/common/google.py", line 668, in access_token
    self._refresh_token()
  File "/Library/Python/2.7/site-packages/libcloud/common/google.py", line 676, in _refresh_token
    self.token = self.oauth2_conn.refresh_token(self.token)
  File "/Library/Python/2.7/site-packages/libcloud/common/google.py", line 395, in refresh_token
    return self.get_new_token()
  File "/Library/Python/2.7/site-packages/libcloud/common/google.py", line 529, in get_new_token
    key = RSA.importKey(self.key)
  File "/Library/Python/2.7/site-packages/Crypto/PublicKey/RSA.py", line 678, in importKey
    if bord(externKey[0])==0x30:
IndexError: string index out of range