Fatal error: Uncaught Error: Using $this when not in object context in C:\xampp\htdocs\web\yii\basic\vendor\yiisoft\yii2-debug\src\views\default\index.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\web\yii\basic\vendor\yiisoft\yii2-debug\src\views\default\index.php on line 13