Notice: Undefined variable: form in /var/www/html/performancereviewapp/vendor/yiisoft/yii2-gii/generators/model/form.php on line 9

Fatal error: Call to a member function field() on a non-object in /var/www/html/performancereviewapp/vendor/yiisoft/yii2-gii/generators/model/form.php on line 9