Fatal error: Uncaught Error: Class "yii\base\Event" not found in /home/telefonai/public_html/test.telefonai.eu/vendor/yiisoft/yii2-symfonymailer/src/PsrEvent.php:14 Stack trace: #0 {main} thrown in /home/telefonai/public_html/test.telefonai.eu/vendor/yiisoft/yii2-symfonymailer/src/PsrEvent.php on line 14