Fatal error: Uncaught Error: Class "chillerlan\QRCodeTest\Output\QROutputTestAbstract" not found in C:\Apache24\htdocs\cms_upgrade\vendor\chillerlan\php-qrcode\tests\Output\QRMarkupTest.php:21 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\chillerlan\php-qrcode\tests\Output\QRMarkupTest.php on line 21