Roof/Wall Height

[JoyA]

This is why I felt like I was in the wrong forum: I really did not understand knee walls and the Help Index was not helping me understand. However, my husband does know these things (I should have asked him first). So now I understand knee walls. We also discovered that the garage was 4 feet shorter than it actually is (my bad, I was too lazy to measure it), but I knew the upstairs room dimensions were right, well once it was shifted over 4 feet, that made it possible to have the knee wall in the right place upstairs. So now I think I have adjusted all the walls, but I get these errors for all the walls I have specified as knee walls when I try to build the roof:



I will try again what you suggested if I can get past these errors.