I have been using an earlier version of Smith Cart for quite some time and don't recall having the same problem as this one.
The issue is that when I attempt to rename the Category module from Smith.CategoryMenu to Categories and/or alter any of the Category Menu settings I get an error - "A critical error has occurred.An unexpected error has occurred". See the image below.
Any idea what my problem might be? I can send you host access details if that is any help as the website is in it's early stage of development.
The same thing is happening with the MiniCart module. I'm using DNN 7.0.4 and the latest trial download of your cart.