Fatal error: Uncaught Error: Class "yii\mail\BaseMessage" not found in C:\xampp\htdocs\arthurkotsch.online\vendor\yiisoft\yii2-symfonymailer\src\Message.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\arthurkotsch.online\vendor\yiisoft\yii2-symfonymailer\src\Message.php on line 18