Fatal error: Uncaught Error: Class "craft\db\Migration" not found in /home/leasingm/public_html/public_html/vendor/ether/simplemap/src/migrations/m190226_143809_craft3_upgrade.php:23 Stack trace: #0 {main} thrown in /home/leasingm/public_html/public_html/vendor/ether/simplemap/src/migrations/m190226_143809_craft3_upgrade.php on line 23