Error message

• Warning: array_diff(): Argument #1 is not an array in FacesExtendable->extend() (line 229 of /home/public/sites/www.hhhpraktijk.nl/sites/all/modules/rules/includes/faces.inc).
• Warning: class_implements(): Class RulesPluginFeaturesIntegrationInterface does not exist and could not be loaded in FacesExtendable->extend() (line 233 of /home/public/sites/www.hhhpraktijk.nl/sites/all/modules/rules/includes/faces.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/public/sites/www.hhhpraktijk.nl/includes/common.inc:2786) in drupal_send_headers() (line 1499 of /home/public/sites/www.hhhpraktijk.nl/includes/bootstrap.inc).
• Error: Unsupported operand types in FacesExtendable->extend() (line 233 of /home/public/sites/www.hhhpraktijk.nl/sites/all/modules/rules/includes/faces.inc).