Nova Authentication Error - 2

2012-02-03 11:32:14,190 ERROR keystone.middleware.ec2_token [-] 'access'
(keystone.middleware.ec2_token): TRACE: Traceback (most recent call last):
(keystone.middleware.ec2_token): TRACE:   File "/usr/lib/python2.7/dist-packages/keystone/middleware/ec2_token.py", line 89, in __call__
(keystone.middleware.ec2_token): TRACE:     token_id = result['access']['token']['id']
(keystone.middleware.ec2_token): TRACE: KeyError: 'access'
(keystone.middleware.ec2_token): TRACE:
2012-02-03 11:32:14,190 INFO nova.api [-] 0.3052s 165.165.2.1 POST /services/Cloud/ None:None 400 [Boto/2.2.1-dev (linux2)] application/x-www-form-urlencoded text/plain