Sometimes a misconfigured Drupal site will display a mysterious "2" or "3" error in the general content area. This happens if the "Error reporting" settings have been configured to display a custom page instead of the default 404 (not found) or 403 (access denied) message and the custom page doesn't actually exist.

This error message has been updated in Drupal 5.x and later versions so that the "2" and "3" are replaced by more helpful error messages.

For cases when the custom page does exist but the "access content" permission is disabled, please see http://drupal.org/node/198975