Fatal error: Uncaught Error: Using $this when not in object context in /var/www/html/forms_dir/vendor/yiisoft/yii2-debug/src/views/default/index.php:13 Stack trace: #0 {main} thrown in /var/www/html/forms_dir/vendor/yiisoft/yii2-debug/src/views/default/index.php on line 13