It says a form cannot be e-filed on my tax return, Form School Cr Res. Which I understand is school related..but I have not been in any schooling in years. Why need this?

While filing tax return, at the very end it says some of my tax forms aren't ready. And if I look it says "School Cr Res" which cannot e-file. I redid everything and made sure I didn't misclick, but it still appears at the end. Why?