Fatal error: Uncaught Error: Interface "Dompdf\Canvas" not found in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-pdfer/includes/dompdf/src/Adapter/CPDF.php:38 Stack trace: #0 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-pdfer/includes/dompdf/src/Adapter/CPDF.php on line 38