Fatal error: Uncaught Error: Class "yii\validators\Validator" not found in /var/www/html/_old/vendor/azbuco/yii2-user/components/ConfirmedEmailValidator.php:10 Stack trace: #0 {main} thrown in /var/www/html/_old/vendor/azbuco/yii2-user/components/ConfirmedEmailValidator.php on line 10