Fatal error: Uncaught Error: Class "Yii" not found in /home/blskysoftware/public_html/migration/vendor/yiisoft/yii2-symfonymailer/tests/MailerTest.php:12 Stack trace: #0 {main} thrown in /home/blskysoftware/public_html/migration/vendor/yiisoft/yii2-symfonymailer/tests/MailerTest.php on line 12