Yes, the field that is incomplete should be shaded or have an exclamation point next to it.
On the screen Let's get some info about your care provider, you have to select one of the following:
Once you have selected one, you have to answer completely the questions that pop up.
You also have to provide a complete address and answer the question about whether the care provider is a member of your household.
If it all looks right and the message is still there:
fwiw I'm getting the same error. Pretty frustrating. Good to know I'm not the only one 🙂