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Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output (/home/server814243/ftp/technikum/vendor/mpdf/mpdf/src/Image/ImageProcessor.php at line 563), unable to output PDF file in /home/server814243/ftp/technikum/vendor/mpdf/mpdf/src/Mpdf.php:9412 Stack trace: #0 /home/server814243/ftp/technikum/controllers/pdf.php(71): Mpdf\Mpdf->Output('80-lecie-szkoly...', 'I') #1 /home/server814243/ftp/technikum/index.php(123): include_once('/home/server814...') #2 {main} thrown in /home/server814243/ftp/technikum/vendor/mpdf/mpdf/src/Mpdf.php on line 9412