Spawn objects along spline with slope check on spawner

[TakeruGrima]

I experiment a lot with the road system and now I wanted to try to spawn stairs along a spline. And the gizmo says I can't spawn anything.

I tried to tweak the slope checking in my spawner and the only way to make this red dot green it's to have the slope checking from 0 to 90, so no slop checking. It seems weird for me and I tried to press the spawn button and it does spawn my stairs. But I am not sure if it spawn the stairs but there is oviously an issue with the slope checking starting above 0.

 

[Bryan]

In the spawner try to enable force spawn in the criteria. 
Then yes for you are using slope rules you would need to adjust that as well.