Fatal error: Uncaught Error: Class 'yii\helpers\StringHelper' not found in /var/www/studio-10.uchetprosto.ru/template-uchet/vendor/yiisoft/yii2-gii/src/generators/crud/default/views/index.php:9 Stack trace: #0 {main} thrown in /var/www/studio-10.uchetprosto.ru/template-uchet/vendor/yiisoft/yii2-gii/src/generators/crud/default/views/index.php on line 9