Can't link products with dynamic options

Hi, I have been using TheCartPress for a couple of years now and think its a great plugin. However, recently (before I upgraded to wp 4.1.1 even) there has been an issue with dynamic options.

There is simply no way to link my dynamic options to my products. When I am in the product editor and scroll down to dynamic options, the only thing available now is ‘manage options list’. Once clicked it simply takes me to a page to add new options but I cannot actually assign an attribute set. I just get this message at the top of that page:

“To create options, you need, first, to assign a Set of Attributes to the product. If you have assigned a set, ensure the set has attributes assigned.”

I can only assume that there has been a problem with the dynamic options plugin itself as I have tried the usual troubleshooting steps (ie. turning off possible conflicting plugins) and I have tried it on a completely fresh install of wordpress.

Any help is very much appreciated!

https://www.ads-software.com/plugins/thecartpress-dynamic-options/