Geschönte Statistiken: Derzeitiges "Arbeitsmarktwunder" ist also gar keins?! (http://tiny.cc/p8tum)

Fehlermeldung

• Notice: Undefined index: comment_node_activitystream_form in drupal_retrieve_form() (Zeile 738 von /usr/share/drupal7/includes/form.inc).
• Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'comment_node_activitystream_form' not found or invalid function name in drupal_retrieve_form() (Zeile 773 von /usr/share/drupal7/includes/form.inc).