Fatal error: Uncaught Error: Call to undefined function Dompdf\mb_internal_encoding() in /var/www/html/vendor/dompdf/src/Dompdf.php:274 Stack trace: #0 /var/www/html/download.php(69): Dompdf\Dompdf->__construct() #1 {main} thrown in /var/www/html/vendor/dompdf/src/Dompdf.php on line 274