Fatal error: Uncaught Error: Class 'yii\debug\Panel' not found in /mnt/www/fss/personnel/vendor/yiisoft/yii2-debug/panels/TimelinePanel.php:27 Stack trace: #0 {main} thrown in /mnt/www/fss/personnel/vendor/yiisoft/yii2-debug/panels/TimelinePanel.php on line 27