Thank you. That worked. I should also point out that when I looked at the require_once("/WA_DigitalFilePro/HelperPHP.php"); code and asked myself why that was pointing to another file on the same web server. Realising this I then saw the folder in my local directory (which I hadn't read in the instructions would magically appear in the background site structure). I uploaded the WA_DigitalFilePro folder along with the edited file updating your changes and now the page works.
Thankyou.