Chapter 27 - Location.placemark warning

I’m getting this warning now that I’m working on Chapter 27.

DataModel.xcdatamodel:Location.placemark: warning: Location.placemark is using a nil or insecure value transformer. Please switch to NSSecureUnarchiveFromDataTransformerName or a custom NSValueTransformer subclass of NSSecureUnarchiveFromDataTransformer [2]

Any thoughts?

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