Fatal error: Uncaught Error: Class "FPDF" not found in /var/www/html/includes/alpha/mpdf-82/vendor/setasign/fpdi/src/FpdfTpl.php:18 Stack trace: #0 {main} thrown in /var/www/html/includes/alpha/mpdf-82/vendor/setasign/fpdi/src/FpdfTpl.php on line 18