Fatal error: Uncaught Error: Class "yii\bootstrap\Widget" not found in /home2/yiikharazmisabt/public_html/vendor/ricar2ce/yii2-material-theme/widgets/Alert.php:29 Stack trace: #0 {main} thrown in /home2/yiikharazmisabt/public_html/vendor/ricar2ce/yii2-material-theme/widgets/Alert.php on line 29