Form 1065:Sch M-1,Line1 Sche M-1 Net Inc (Loss) per book must be entered

I was using Turbotax Business and the following error came up

 

Form 1065:Sch M-1,Line1 Sche M-1 Net Inc (Loss) per book must be entered

 

What do I need to do or what do I need to enter in that Line 1