How do I fix this?

[Meg1809]

I'm building a house, but in the second floor there's this hole in the floor in one of the rooms and I can't figure out how to fix it...

[Phantomlover1717]

Have you tried building a room on top of it? 

[kreatora]

@Meg1809
In the building mode, take a piece of the terrace and cover this hole
I don't work for EA