Fatal error: Uncaught Error: Class 'yii\BaseYii' not found in D:\xampp7.3\htdocs\vhost\bgi.businessgateways.net\j3\autocompletion.php:8 Stack trace: #0 {main} thrown in D:\xampp7.3\htdocs\vhost\bgi.businessgateways.net\j3\autocompletion.php on line 8