Fatal error: Uncaught Error: Class "craft\db\Migration" not found in /home/leasingm/public_html/public_html/vendor/craftcms/cms/src/migrations/m170523_190652_element_field_layout_ids.php:17 Stack trace: #0 {main} thrown in /home/leasingm/public_html/public_html/vendor/craftcms/cms/src/migrations/m170523_190652_element_field_layout_ids.php on line 17