401 Unauthorized Error For AP v1.1


I am getting 401 unauthorized error. The same code was working for me before. Now it is generating a 401 error. I am using proper consumer key and consumer secret. Evreything is same, it just stopped working when I upgraded from API v1.0 to API v1.1. Kindly explain. Here is the consumer key caOc6QSVZPw45DqpCBcDKA