Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/staging/hr-witty/migrations/m210629_060424_seed_account_contacts.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/staging/hr-witty/migrations/m210629_060424_seed_account_contacts.php on line 8