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Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output (/var/www/html/wp-content/plugins/wp-mpdf/wp-mpdf.php at line 272), unable to output PDF file in /var/www/html/wp-content/plugins/wp-mpdf/vendor/mpdf/mpdf/src/Mpdf.php:9579 Stack trace: #0 /var/www/html/wp-content/plugins/wp-mpdf/wp-mpdf.php(293): Mpdf\Mpdf->Output('frankenland-fit...', 'I') #1 /var/www/html/wp-content/plugins/wp-mpdf/wp-mpdf.php(528): mpdf_output('<p><!DOCTYPE ht...', true, true, '', '/var/www/html/w...') #2 /var/www/html/wp-includes/class-wp-hook.php(341): mpdf_exec(true) #3 /var/www/html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #4 /var/www/html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #5 /var/www/html/wp-includes/template-loader.php(23): do_action('template_redire...') #6 /var/www/html/wp-blog-header.php(19): require_once('/var/www/html/w...') #7 /var/www/html/index.php(17): require('/var/www/html/w...') #8 {main} thrown in /var/www/html/wp-content/plugins/wp-mpdf/vendor/mpdf/mpdf/src/Mpdf.php on line 9579