Need help with an area on the application

On the Financial and Parental Information it asks for my “adjusted gross income for 2017” from my tax reform but I didn’t file any taxes. It ALSO asks for “untaxed income and benefits for 2017”. I’m applying as an independent student because the rules state that it’s under federal regulations to consider yourself independent if you were born before 1996. (I was born 1995) So what do I put there because for the fee waiver checklist it says to avoid putting the same number in both areas or the fee waiver won’t be given to me. I went to a workshop today and they told me to put 0 for both areas, however, when I click to submit it gives me a warning that I have the same number in both areas. I’m just lost and I really don’t want to pay over $200 to apply.