Hey, just so we can narrow down any potential errors that may have carried over from previous screens. Have you tried restarting the interview and ensuring that you've filled in all the required fields for each step? Do you get the same error again?
The form changes depending on the region you're from, so the error you're experiencing is most likely different than the one described by the original poster. We have seen the error messages be confusing or sometimes broken when taking the tax interview, so going through it again may make it clear what the issue was.