Can't display files in views (Drupal)

1. Create 'image' field for events.
2. Upload an image to a test event.
3. Update database integration (settings.php)
4. Create view with title and image fields.

Views admin gives this error: The handler for this item is broken or missing and cannot be used. If a module provided the handler and was disabled, re-enabling the module may restore it. Otherwise, you should probably delete this item.

The page itself gives this error: Notice: Undefined property: stdClass::$unknown in civicrm_handler_field_link_event->render() (line 177 of [root]/sites/all/modules/civicrm/drupal/modules/views/civicrm/civicrm_handler_field_link_event.inc).