Warning: A non-numeric value encountered in /vendor/mpdf/mpdf/src/Color/ColorConverter.php on line 228

Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output (/vendor/mpdf/mpdf/src/Color/ColorConverter.php at line 228), unable to output PDF file in /vendor/mpdf/mpdf/src/Mpdf.php:9412 Stack trace: #0 /controllers/pdf.php(71): Mpdf\Mpdf->Output('informacje-na-t...', 'I') #1 /index.php(123): include_once('/controllers/pd...') #2 {main} thrown in /vendor/mpdf/mpdf/src/Mpdf.php on line 9412