Warning: Undefined variable $html in /www/htdocs/w0190226/ben/pdf_neu/index.php on line 23

Fatal error: Uncaught Mpdf\MpdfException: WriteHTML() requires $html be an integer, float, string, boolean or an object with the __toString() magic method. in /www/htdocs/w0190226/ben/pdf_neu/vendor/mpdf/mpdf/src/Mpdf.php:13230 Stack trace: #0 /www/htdocs/w0190226/ben/pdf_neu/index.php(23): Mpdf\Mpdf->WriteHTML(NULL) #1 {main} thrown in /www/htdocs/w0190226/ben/pdf_neu/vendor/mpdf/mpdf/src/Mpdf.php on line 13230