The undo button is broke for the current build
How to reproduce:
1: Build a building
2: Place a wall, or floor, or windows, ect ect
3: Click undo button in build tool.
Expected result: Removes the last placement you put in.
Actual result: Does not remove the last placement and get the error. Can no longer build on your design.
Work around: Just click the remove build in tool to start over on build.
Just to confirm this bug, I repeated the process several times.