Creating custom order template from scratch--file won't show up!

[lotstolearn]

Hey, I'm creating a custom order template from scratch. I've created a folder "neworderform" and put it in `/whmcs/templates/orderforms`. I put a file `cart.php` in it, and it shows up as a new theme under General Settings > Ordering, but when I go to http://mydomain.com/cart.php?carttpl=neworderform, I just get a blank page and don't see the content of my file.

 

What am I doing wrong?

[sentq]

apply the following to see what causing the error (blank page): http://docs.whmcs.com/Common_Troubleshooting_Tips#Blank_Page