Fatal error: Uncaught Error: Class 'yii\helpers\StringHelper' not found in C:\xampp\htdocs\aroflo-dataforce\vendor\yiisoft\yii2-gii\src\generators\crud\default\views\index.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\aroflo-dataforce\vendor\yiisoft\yii2-gii\src\generators\crud\default\views\index.php on line 9