Fatal error: Uncaught Error: Class "cebe\gravatar\Gravatar" not found in /var/www/binary/vendor/dmstr/yii2-adminlte-asset/example-views/testing/app/layouts/_sidebar.php:8 Stack trace: #0 {main} thrown in /var/www/binary/vendor/dmstr/yii2-adminlte-asset/example-views/testing/app/layouts/_sidebar.php on line 8