Fatal error: Uncaught Error: Class 'craft\db\Migration' not found in /home/mpolsk5/public_html/visibilityfuel.com/vendor/craftcms/cms/src/migrations/m160829_000000_pending_user_content_cleanup.php:13 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/visibilityfuel.com/vendor/craftcms/cms/src/migrations/m160829_000000_pending_user_content_cleanup.php on line 13