I ran into this too, but I was able to get past it by following the instructions of step 2 in your link (thanks, by the way):
- Add the MapKit framework to the project. (Control + Click Frameworks
folder -> Add -> Existing Frameworks)
I just searched for MapKit.framework, added it to the project, and the error went away.
I haven’t added any map code yet (although I do have a MapViewDelegate connected in IB), but it’s working fine so far!