Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/migrations/m210111_083558_insert_update_property_group_add_new_entry.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/migrations/m210111_083558_insert_update_property_group_add_new_entry.php on line 8