Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/migrations/m201222_004026_update_org_modules_add_column_is_trial.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/migrations/m201222_004026_update_org_modules_add_column_is_trial.php on line 8