Fatal error: Uncaught Error: Using $this when not in object context in /home2/yiikharazmisabt/public_html/vendor/dz0wkn/yii2-material-kit/views/layouts/main.php:17 Stack trace: #0 {main} thrown in /home2/yiikharazmisabt/public_html/vendor/dz0wkn/yii2-material-kit/views/layouts/main.php on line 17