Fatal error: Uncaught Error: Class "yii\widgets\ActiveForm" not found in /home/tandomain/projects.codersinsight.co.tz/hrsystem/backend/views/course/_search.php:13 Stack trace: #0 {main} thrown in /home/tandomain/projects.codersinsight.co.tz/hrsystem/backend/views/course/_search.php on line 13