Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/migrations/m210707_000214_update_okr_key_result_and_checkin.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/migrations/m210707_000214_update_okr_key_result_and_checkin.php on line 8