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Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output (/home/oahure/public_html/PDF_Summary.php at line 7), unable to output PDF file in /home/oahure/vendor/mpdf/mpdf/src/Mpdf.php:9572 Stack trace: #0 /home/oahure/public_html/PDF_Summary.php(296): Mpdf\Mpdf->Output() #1 {main} thrown in /home/oahure/vendor/mpdf/mpdf/src/Mpdf.php on line 9572