Fatal error: Uncaught Error: Class 'yii\base\Model' not found in /mnt/www/fss/casefiling/vendor/yiisoft/yii2-debug/src/models/UserSwitch.php:24 Stack trace: #0 {main} thrown in /mnt/www/fss/casefiling/vendor/yiisoft/yii2-debug/src/models/UserSwitch.php on line 24