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Fatal error: Uncaught Exception: TCPDF ERROR: Some data has already been output, can't send PDF file in /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon/4101/zf/api/vendor/tecnickcom/tcpdf/tcpdf.php:3007 Stack trace: #0 /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon/4101/zf/api/vendor/tecnickcom/tcpdf/tcpdf.php(7696): TCPDF->Error() #1 /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon/4101/zf/api/vendor/spipu/html2pdf/src/Html2Pdf.php(575): TCPDF->Output() #2 /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon/4101/zf/api/pdf_preview.php(92): Spipu\Html2Pdf\Html2Pdf->output() #3 {main} thrown in /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon/4101/zf/api/vendor/tecnickcom/tcpdf/tcpdf.php on line 3007