Fatal error: Uncaught Error: Call to a member function field() on null in /var/www/html/ng-crm/yiiapp/vendor/yiisoft/yii2-mongodb/src/gii/model/form.php:6 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/vendor/yiisoft/yii2-mongodb/src/gii/model/form.php on line 6