Fatal error: Uncaught Error: Class 'craft\db\Migration' not found in /home/luxurytr/public_html/lt8/vendor/craftcms/cms/src/migrations/m171231_055546_environment_variables_to_aliases.php:15 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/craftcms/cms/src/migrations/m171231_055546_environment_variables_to_aliases.php on line 15