Webform will not submit or email submission

I recently inherited a Drupal site from our web developer who left. I was working on a webform and had been doing very well with it. I had broken it into several pages, and was able to submit data and get an email confirmation with no issue. Because the form was split into several pages, I thought it would be useful to show the user a confirmation page that shows all of the fields that they filled out and give them the opportunity to print it. It seemed very straight-forward. https://www.drupal.org/node/1515548. However, ever since I did this (on Friday), I get an "Error 500 - Internal Server Error" on every webform on our site when I try and submit data. The rest of our pages and such seem fine. I have tried replacing all the files in the webform template directory and I even had HostGator restore the entire "sites" directory and it is still not working. I am sure it is something simple, but I have been working on this for 2.5 days and I really don't want to mess it up more than it already is. The data does seem to save fine to the underlying tables. However, when I view the data and hit "resend email", I get the same error.