FIX: I had the same very frustrating issue but think I figured it out, as I just submitted successfully. You must open the FORMS view (top right next to Live tax advice, at least on my Windows desktop version). Then go to the Form with the error from the left nav bar (it will have a red error symbol next to it). MANUALLY delete the offending 0. I think for me it showed "0." with the period and I had to delete both characters then pressed tab and the error cleared.
When I tried someone else's fix of not entering anything in the box in the step by step view, that didn't work for me. But when I changed to form views it let me delete the 0 and submit. Hope this helps!!
@donnielciii @warriorstax @jjco @adacovsk
