Fatal error: Uncaught exception 'Exception' with message 'WKPDF didn't return any data.
/var/www/wkhtmltopdf-amd64
' in /drupal/usgbc.org/wkpdf.php:227 Stack trace: #0 /drupal/usgbc.org/dopdf.php(83): WKPDF->render() #1 {main} thrown in /drupal/usgbc.org/wkpdf.php on line 227