Fatal error: Uncaught Error: Class 'craft\mail\Mailer' not found in /home/mpolsk5/public_html/visibilityfuel.com/vendor/craftcms/cms/src/test/TestMailer.php:22 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/visibilityfuel.com/vendor/craftcms/cms/src/test/TestMailer.php on line 22