[request] => /statuses/user_timeline.xml?oauth_version=1.0&oauth_nonce=8ad5454ef97aeec8ff000235eea2acfc&oauth_timestamp=1251469868&oauth_consumer_key=y2l1dK2jFnxTb01CHTUMrw&count=10&since_id=3446495596&oauth_token=37899551-G1yCwWHI8rtkcjgTILEV0O98kyOlCzNfo0Dhhr88&oauth_signature_method=HMAC-SHA1&oauth_signature=Jf1SOC7dG1y5ose3mwTfDbjt2gs%3D
[error] => This method requires authentication.
Why this call causing error? earlier this was working fine.