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[Sowelu]

Open the b->C menu.
Try to place a wall on a floor that you can't reach (like, on top of a previously built wall, with no way up).
Observe that the 'X' for placement is dark purple.
Now try to place a floor on the same place...
Observe that the 'X' for placement is light purple, instead!

Same error message, different colors.

[Tayrin]

I'm guessing light purple means you're trying to build something that'd be walkable, and dark purple means it wouldn't be walkable, much like the light and dark green squares you get when building a workshop.

[Draco18s]

Sounds right.  Try building a pump up there.