Fatal error: Uncaught Error: Class 'yii\mail\BaseMessage' not found in C:\xampp\htdocs\web\yii\basic\vendor\yiisoft\yii2-swiftmailer\src\Message.php:36 Stack trace: #0 {main} thrown in C:\xampp\htdocs\web\yii\basic\vendor\yiisoft\yii2-swiftmailer\src\Message.php on line 36