State tax filing

Thank you! I know it .. the Ttax information is confusing.. "congratulation!! you can e-file NYS amended ..let's start" and then ..upps.. you can't. "the date on your amended NYS 2018 should be before 12/01/2019", (why??) I finished it 03/22/2020  ( I have 3 year after date when my original return was filed, which was 04/08/2019, I had a refund , didn't owe.."

Anyway I am going to mail it ..