Hi Glenda,
Do you happen to have 2 bits assigned and are trying to run the “roughing” bit?
If you like, you can actually share the entire project and I (or others) can take a look at the project and explain in a much clearer terms the reason you are seeing that error window.
EDIT:
I just found your posting of the project in another thread…
Thanks, I’ll record a quick video and post that to show the issue and how to best resolve it.