Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/migrations/m191204_044348_alter_position_id_column_from_request_approver_table.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/migrations/m191204_044348_alter_position_id_column_from_request_approver_table.php on line 8