Fatal error: Uncaught Exception: Data has already been sent to output (/home/bws/public_html/dev/wp-content/plugins/pdf-print-pro/vendor/mpdf/mpdf/src/Tag/BlockTag.php at line 901), unable to output PDF file
in /home/bws/public_html/dev/wp-content/plugins/pdf-print-pro/vendor/mpdf/mpdf/src/Mpdf.php on line 9512

Call stack:

1. Mpdf\Mpdf::Output()
   wp-content/plugins/pdf-print-pro/pdf-print-pro.php:1903
2. pdfprnt_print()
   wp-includes/class-wp-hook.php:308
3. WP_Hook::apply_filters()
   wp-includes/class-wp-hook.php:332
4. WP_Hook::do_action()
   wp-includes/plugin.php:565
5. do_action_ref_array()
   wp-includes/class-wp.php:797
6. WP::main()
   wp-includes/functions.php:1334
7. wp()
   wp-blog-header.php:16
8. require()
   index.php:17