Fatal error: Uncaught Mpdf\MpdfException: Invalid input characters. Did you set $mpdf->in_charset properly? in /var/www/html/pdf/vendor/mpdf/mpdf/src/Mpdf.php:25970 Stack trace: #0 /var/www/html/pdf/vendor/mpdf/mpdf/src/Mpdf.php(13133): Mpdf\Mpdf->purify_utf8('<!doctype html>...', false) #1 /var/www/html/pdf/report.php(165): Mpdf\Mpdf->WriteHTML('<!doctype html>...') #2 {main} thrown in /var/www/html/pdf/vendor/mpdf/mpdf/src/Mpdf.php on line 25970