Wall Overlap Randomly near joint of internal wall.

[Anonymous]

I have not seen this before in Revit 2017. I created a new wall type and applied to external walls and at one point on the building I got an error telling me that some walls were overlapping. I have not disallowed any joins or done anything I wouldn't normally do. Has anyone ever seen this before?

[Sahay_R]

Looks as though there are duplicates sitting on top of each other. Revit does not like that. To make sure, use a crossing window to select the wall, and Properties will tell you the number of objects that have been selected.  Delete the extras

[Stanis-74]

same story with windows "interferense check" and "review warnings"

although you should built walls from level to level. i`m not sure that it`s comfortable, but this is the way to do not accept errors.