Fatal error: Uncaught Error: Class 'yii\validators\UniqueValidator' not found in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/validators/UniqueValidator.php:22 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/validators/UniqueValidator.php on line 22