[support] Twitter module

I have installed the *Twitter module together with oath ( http://drupal.org/project/twitter and http://drupal.org/node/476824).*

I also went to dev.twitter.com and registered the application, generating: consumer key and consumer secret -as requested by the Twitter set up. It never asked for a user name and passwd, just the consumer key and consumer secret. I placed the block and nothing happened, when I try the call back url I get :

warning: Invalid argument supplied for foreach() in /home1/poapproj/public_html/internacionalizacion/cms/sites/all/modules/twitter/twitter.lib.php on line 266.

what am I doing wrong? is this my mistake? a server config problem? or a problem in the module?

thanks .