Fatal error: Uncaught Error: Class "yii\debug\panels\MailPanel" not found in /home/telefonai/public_html/test.telefonai.eu/vendor/craftcms/cms/src/debug/MailPanel.php:21 Stack trace: #0 {main} thrown in /home/telefonai/public_html/test.telefonai.eu/vendor/craftcms/cms/src/debug/MailPanel.php on line 21