Fatal error: Uncaught Error: Class 'PhpOffice\PhpPresentation\Slide\AbstractBackground' not found in /var/www/html/scorm/vendor/phpoffice/phppresentation/src/PhpPresentation/Slide/Background/Image.php:25 Stack trace: #0 {main} thrown in /var/www/html/scorm/vendor/phpoffice/phppresentation/src/PhpPresentation/Slide/Background/Image.php on line 25