In the new osapiOAuth3Legged_10a the class name in lines 77 and 80 has not been changed to "osapiOAuth3Legged_10a" but is still "osapiOAuth3Legged". Fixed code would be i.e.:

• @return osapiOAuth3Legged_10a the logged-in provider instance */ public static function performOAuthLogin($consumerKey, $consumerSecret, osapiStorage $storage, osapiProvider $provider, $localUserId = null, $userId = null) { $auth = new osapiOAuth3Legged_10a($consumerKey, $consumerSecret, $storage, $provider, $localUserId, $userId);