Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in /home/appilogicx/public_html/marketing/vendor/sendgrid/smtpapi/test/Smtpapi/Header.php:3 Stack trace: #0 {main} thrown in /home/appilogicx/public_html/marketing/vendor/sendgrid/smtpapi/test/Smtpapi/Header.php on line 3