When I tried to enter the same email address to subscribe to the newsletter (on my sidebox) twice, I get the following red box with the message" This email address has already placed a Newsletter-Only subscription. If you did not receive the confirmation request, please email..."

But with this 3 paragraphs following it: ---->

Warning: main(includes/templates/template_default/templates/tpl_subscribe_header.php) [function.main]: failed to open stream: No such file or directory in /home/remakeable/domains/remakeables.com/public_html/shop/includes/modules/remake/subscribe_header.php on line 20

Warning: main(includes/templates/template_default/templates/tpl_subscribe_header.php) [function.main]: failed to open stream: No such file or directory in /home/remakeable/domains/remakeables.com/public_html/shop/includes/modules/remake/subscribe_header.php on line 20

Fatal error: main() [function.require]: Failed opening required 'includes/templates/template_default/templates/tpl_subscribe_header.php' (include_path='.:/usr/local/lib/php') in /home/remakeable/domains/remakeables.com/public_html/shop/includes/modules/remake/subscribe_header.php on line 20

Why didn't it just display a simple message (or just the red box?). What went wrong?

Any help would be greatly appreciated, thanks!
Amy