OAuth Error: ExceptionRequest failed with code 401: The consumer_key "xxx" token "yyy" combination does not exist or is not enabled.

Hi,

I have register as authenticate API and when i try to use it it gives me below error. 

ExceptionRequest failed with code 401: The consumer_key "xxx" token "yyy" combination does not exist or is not enabled.

I use oauth-php and I feel like it happen because I request it twice but i don't know how to fix it. (My first attempt to deal with OAuth)

You can see the code below.
http://pastebin.com/Epkqdjx4 

Really appreciate your help on this.

Thanks