Update an Existing Xcode Project Core Data with CloudKit & Manage Multiple Stores

Hi,

I have.a project that uses CoreData and I want to add some of the data to iCloud to sync with a Watch app and I ticked the option for the Default configuration to use iCloud and It worked but now I don't want to include images in the cloud because it became too large so I Seperated the images into a different data thing and as per instructions here https://developer.apple.com/documentation/coredata/mirroring_a_core_data_store_with_cloudkit/setting_up_core_data_with_cloudkit I added a configuration "Local" and "Cloud" and change the code as below -

original

Code Block 
lazy var persistentContainer: NSPersistentContainer = {
    let container = NSPersistentContainer(name: "DataModel")
    container.loadPersistentStores(completionHandler: {
        storeDescription, error in
        if let error = error {
            print("Could load data store: \(error)")
         }
    })
    print("Loaded data store: DataModel")
    return container
}()

I created two configurations as per the video and ticked use with iCloud on the one I would like to sync with iCloud.

new code

Code Block 
lazy var persistentContainer: NSPersistentContainer = {
    var container = NSPersistentContainer(name: "DataModel")
    if #available(iOS 13.0, *) {
        container = NSPersistentCloudKitContainer(name: "DataModel")
        let local = NSPersistentStoreDescription(url: URL(fileURLWithPath: "/files/local.sqlite"))
        local.configuration = "Local"
        let cloud = NSPersistentStoreDescription(url: URL(fileURLWithPath: "/files/cloud.sqlite"))
        cloud.configuration = "Cloud"
        cloud.cloudKitContainerOptions =
            NSPersistentCloudKitContainerOptions(
                containerIdentifier: "iCloud.com.AppName")
        container.persistentStoreDescriptions = [ local, cloud ]
        container.loadPersistentStores { storeDescription, error in
            guard error == nil else {
                fatalError("Could not load persistent stores. \(error!)")
            }
        }
        return container
    } else {
        container.loadPersistentStores(completionHandler: {
            storeDescription, error in
            if let error = error {
                print("Could load data store: \(error)")
            }
        })
        print("Loaded data store: DataModel")
        return container
    }
}()

Most of this code I got from the video https://developer.apple.com/videos/play/wwdc2019/202/

but I keep getting an error about loading or saving the persistent store or something

fatal error: Could not load persistent stores. Error Domain=NSCocoaErrorDomain Code=512 "The file couldn’t be saved." UserInfo={reason=Failed to create file; code = 2}:

Is anyone able to point out what I am not doing right?
Thanks.