Fatal error: Uncaught Error: Class 'yii\base\Action' not found in C:\xampp\htdocs\web\yii\basic\vendor\yiisoft\yii2-debug\src\actions\db\ExplainAction.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\web\yii\basic\vendor\yiisoft\yii2-debug\src\actions\db\ExplainAction.php on line 22