Thread:Extension talk:OpenID/Call to a member function getAssociation() on a non-object in ...Consumer.php on line 945/reply (4)

I already answered you directly. The gmd functions are apparently missing in your installation. This is explained for example on the main page and here on top in the checklist 2: PHP modules, which the extension requires.

Problem appears to be user-specific (missing gmd); issue closed.