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Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output, unable to output PDF file in /web/htdocs/www.massimocec.it/home/wp-content/plugins/pdf-print-pro/vendor/mpdf/mpdf/src/Mpdf.php:9545 Stack trace: #0 /web/htdocs/www.massimocec.it/home/wp-content/plugins/pdf-print-pro/pdf-print-pro.php(2270): Mpdf\Mpdf->Output() #1 /web/htdocs/www.massimocec.it/home/wp-includes/class-wp-hook.php(324): pdfprnt_print() #2 /web/htdocs/www.massimocec.it/home/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #3 /web/htdocs/www.massimocec.it/home/wp-includes/plugin.php(565): WP_Hook->do_action() #4 /web/htdocs/www.massimocec.it/home/wp-includes/class-wp.php(830): do_action_ref_array() #5 /web/htdocs/www.massimocec.it/home/wp-includes/functions.php(1336): WP->main() #6 /web/htdocs/www.massimocec.it/home/wp-blog-header.php(16): wp() #7 /web/htdocs/www.massimocec.it/home/index.php(17): require('...') #8 {main} thrown in /web/htdocs/www.massimocec.it/home/wp-content/plugins/pdf-print-pro/vendor/mpdf/mpdf/src/Mpdf.php on line 9545