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Error message

• Warning: file_get_contents(https://graph.facebook.com/oauth/access_token?client_id=&client_secret=&grant_type=client_credentials) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request in _facebook_pull_accesstoken() (line 294 of /var/www/he/hezeki37/public_html/sites/all/modules/facebook_pull/facebook_pull.module).
• Warning: file_get_contents(https://graph.facebook.com//?&limit=) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request in _facebook_pull_feed() (line 275 of /var/www/he/hezeki37/public_html/sites/all/modules/facebook_pull/facebook_pull.module).