How do I complete Sch SE-T Pt 3? Line 4c shows loss from my Sch C. Line 18 asks how much of line 3 is from 3/27 - 12/31/20. I get an error msg deferral is too large

No matter what amount I enter, I get the "Max deferral line 18 is too large" error.  The program keeps flagging this an issue needing fixed.