Broad cast preview error

[lukeheights]

i created a new broadcast message. when I clicked on 'preview' I get this error:

Warning: include(preview_email.php) [function.include]: failed to open stream: No such file or directory in /home/myhost12/public_/happysuccessful.com/wp-content/plugins/wp-responder-email-autoresponder-and-newsletter-plugin/helpers/routing.php on line 156

Warning: include(preview_email.php) [function.include]: failed to open stream: No such file or directory in /home/myhost12/public_html/happysuccessful.com/wp-content/plugins/wp-responder-email-autoresponder-and-newsletter-plugin/helpers/routing.php on line 156

Warning: include() [function.include]: Failed opening 'preview_email.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/myhost12/public_html/happysuccessful.com/wp-content/plugins/wp-responder-email-autoresponder-and-newsletter-plugin/helpers/routing.php on line 156