Work plane problem

[Bryan Thatcher]

I set the work plane, pick a view to edit it in, try to create a floor and I get this error. What does it mean and how do I set the work plane to a level? Thanks.

[rosskirby]

I've seen this error when trying to create a ceiling in a view where the workplane was set to something other than a level. I'm guessing the same is true for floors. Since floors and ceilings reference a specific level, and not necessarily a workplane, you'll have to use the slope tool to get the floor where you want it, rather than trying to create it on a workplane.