More than one slopes defined error for roof

[Anonymous]

When i using Revit 2020 to model a gabled roof and adding slope to two sides, there is an error "more than one slope defined" Why it happens? what is the actual issue? Please Help if anybody know. Thanks 

[Anonymous]

here i am attaching additional details of what i am asking

[barthbradley · Accepted solution]

Because that's a floor, not a roof.