Yahoo Developer App - quick help needed

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Bids
4
Avg Bid (USD)
$65
Project Budget (USD)
$30 - $250

Project Description:
Trying to make my first Yahoo app.

Having a problem with getting the user's profile:
http://social.yahooapis.com/v1/user/$guid/profile

It says:
"Please provide valid credentials. OAuth oauth_problem="signature_invalid", realm='yahooapis.com""


NOTE: My script already passes oauth authenctication, and obtains the auth token fine!

Please see my script (yahoo.php attached).

Skills required:
PHP
Additional Files: yahoo-oauth_helper.php yahoo.php yahoo-globals.php
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