Fatal error: Uncaught Error: Interface 'craft\base\Serializable' not found in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/test/mockclasses/serializable/Serializable.php:19 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/test/mockclasses/serializable/Serializable.php on line 19