Basic CAD issue
 

Hi, I'm fairly new to Star-CCM+ and CFD in general
I've ran through a good amount of tutorials now with generally no issue.

My problem is that I've made a very basic shape for the "backwards facing step" tutorial and the error message says "No coincident faces or edges found" and also "no interfaces were created". I had this similar issue when trying to do the cyclone tutorial. The geometries are really not all that complex and I'm not sure what I'm doing wrong. I tried making the part in Creo Parametric since it is more intuitive to me, but I also cannot import that .prt either.

I have named all my faces as the tutorial says (using Star-CCM's Cad program) and constraints are in place. Please let me know if there are any suggestions! Thanks