What does the "Couldn't compile connection:" error mean?
The problem is that this is a prototype cell. It is meaningless to have an outlet to something in it, because it isn't a real cell: it's a model for what might be dozens or hundreds of cells, and which one would the outlet point to in that case?
SWIFT 2
I was creating a popover segue and I was getting the same error.
What I did was follow @matt's answer by not putting it on a cell, which is logical now that he explained it!
Instead, I put the TableView as the anchor and it worked fine.
Hope that helps those in the future.