Fatal error: Uncaught Error: Class "yii\helpers\StringHelper" not found in /users/quirl/www/filemanager/spark/protected/vendor/yiisoft/yii2-gii/src/generators/crud/default/views/index.php:9 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/vendor/yiisoft/yii2-gii/src/generators/crud/default/views/index.php on line 9