Problem with API "get_oauth_request_token" method

Hello,

I was trying to post in getsatisfaction.com using your API.
But the API method to get tokens just don't work.

Here is how I made a request for tokens using PHP library code from API docs:

$tok = get_oauth_request_token($consumer_data);

But this methods returns blank array & no error message.
I am not getting what is wrong and without getting tokens I am unable to proceed further with My code.

Please fix this problem.