I'm getting error message "You must fix errors on this page before continuing." but it doesnt tell me what the errors are

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:

• Employer Identification Number (EIN), 
• Social Security number of Care Provider or 
• Other. 

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:

1. Select Back in the lower left corner. 
2. Select Delete to the right of the entry you made, and repeat if there's more than one entry.
3. Once there are no entries under the gray bar, select Add another Care Provider and try again. 

fwiw I'm getting the same error. Pretty frustrating. Good to know I'm not the only one 🙂