Fatal error: Uncaught Error: Class "chillerlan\QRCode\Output\QROutputAbstract" not found in C:\Apache24\htdocs\cms_upgrade\vendor\chillerlan\php-qrcode\examples\MyCustomOutput.php:17 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\chillerlan\php-qrcode\examples\MyCustomOutput.php on line 17