How to store the PHPersistentChangeToken?

Question

I just can't use NSUserDefault to store it:

UserDefaults.standard.set(PHPhotoLibrary.shared().currentChangeToken, forKey: "token")

Here is the error:

[User Defaults] Attempt to set a non-property-list object <PHPersistentChangeToken: 0x600000e69f40: persistentHistoryToken=<NSPersistentHistoryToken - {
    "3F642A05-50EB-4DB3-8C26-3554B5F25849" = 110;
}>, version=1> as an NSUserDefaults/CFPreferences value for key token