Error message

• User warning: The following module is missing from the file system: drupal_wiki. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1187 of /homepages/4/d94340237/htdocs/drupal7/includes/bootstrap.inc).
• Deprecated function: dirname(): Passing null to parameter #1 ($path) of type string is deprecated in classloader_init() (line 38 of /homepages/4/d94340237/htdocs/drupal7/sites/all/modules/classloader/classloader.module).