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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/mmcon4_10/rj/pdfgen/vendor/tecnickcom/tcpdf/tcpdf.php:2927 Stack trace: #0 /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon4_10/rj/pdfgen/vendor/tecnickcom/tcpdf/tcpdf.php(7626): TCPDF->Error('Some data has a...') #1 /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon4_10/rj/pdfgen/src/Html2Pdf.php(510): TCPDF->Output('pdf-vorschau.pd...', 'I') #2 /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon4_10/rj/pdfgen/preview.php(92): Spipu\Html2Pdf\Html2Pdf->output('pdf-vorschau.pd...', 'I') #3 {main} thrown in /var/www/vhosts/matthaesmedien.net/httpdocs/mmcon4_10/rj/pdfgen/vendor/tecnickcom/tcpdf/tcpdf.php on line 2927