Had coverage through healthcare.gov last year from January to October and TurboTax import amounts for those but I can't continue because amounts in rows 31/32 are 0.

The validation seems to block validating and continuing and wants all months (rows) to have an amount greater than 0. What do I do?

leave the months that are 0 blank.  TT in many cases does not like 0's 

That was a good suggestion. For anyone else having this issue, note that all 3 columns in the row must be clearer in order for the error message to disappear.