Fatal error: Uncaught Error: Using $this when not in object context in /var/www/binary/vendor/dmstr/yii2-adminlte-asset/example-views/testing/app/layouts/main.php:7 Stack trace: #0 {main} thrown in /var/www/binary/vendor/dmstr/yii2-adminlte-asset/example-views/testing/app/layouts/main.php on line 7