Fatal error: Uncaught Error: Class 'craft\db\Migration' not found in /home/luxurytr/public_html/lt8/vendor/craftcms/cms/src/migrations/m170206_142126_system_name.php:11 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/craftcms/cms/src/migrations/m170206_142126_system_name.php on line 11