Unrecognized selector sent to instance?

I have seen that a few others have had this problem as well. I'm trying to follow a tutorial online that shows how to create animated pins on a MapView.

MKMapKit Hexagon or Square Overlay

I want to make overlay with hexagon or squares over google map with MKMapKit. Not just one hexagon or square, i want to use google map like a tile based map with full overlay with hexagons in every 1km area.