Fatal error: Uncaught Error: Class "yii\debug\Panel" not found in C:\xampp\htdocs\arthurkotsch.online\vendor\yiisoft\yii2-debug\src\panels\MailPanel.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\arthurkotsch.online\vendor\yiisoft\yii2-debug\src\panels\MailPanel.php on line 26