Chapter 7: No Method declared with Objective-C selector

I’m getting a warning that says "No Method declared with Objective-C ‘persistentStoreDidImportUbiquitousContentChanges::’

The code looks like this:
ubiquitousChangesObserver?.addObserver(self,
selector: “persistentStoreDidImportUbiquitousContentChanges:”,
name: NSPersistentStoreDidImportUbiquitousContentChangesNotification,
object: coordinator)

When I use Xcodes auto fix feature it changes it to this, but the warning remains.

ubiquitousChangesObserver?.addObserver(self,
selector: Selector(“persistentStoreDidImportUbiquitousContentChanges:”),
name: NSPersistentStoreDidImportUbiquitousContentChangesNotification,
object: coordinator)

I looked at the provided sample files and they also seem to have the same issue.

What should I change it to, to eliminate this error?

Which version of Xcode are you using?