Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/migrations/m221117_092039_add_payment_plan_column_to_subscription_plan.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/migrations/m221117_092039_add_payment_plan_column_to_subscription_plan.php on line 8