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Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output (/www/doc/www.menubot.cz/www/www/app/users/standardmenu-pdf.php at line 7), unable to output PDF file in /www/doc/www.menubot.cz/www/app/lib/MPDF811/vendor/mpdf/mpdf/src/Mpdf.php:9568 Stack trace: #0 /www/doc/www.menubot.cz/www/www/app/users/standardmenu-pdf.php(147): Mpdf\Mpdf->Output('MENU.pdf', 'I') #1 {main} thrown in /www/doc/www.menubot.cz/www/app/lib/MPDF811/vendor/mpdf/mpdf/src/Mpdf.php on line 9568