'ErrorType' is not convertible to 'NSError'

Question

I have an error with Google Analytics:

'ErrorType' is not convertible to 'NSError'; did you mean to use 'as!' to force downcast?

It happen when I'm trying to call 2 times createScreenView

I do this:

    override func viewDidLoad() {


        let tracker = GAI.sharedInstance().defaultTracker
        tracker.set(kGAIScreenName, value: "Demande Gratuite")

        var builder = GAIDictionaryBuilder.createScreenView().build() as! [NSObject : AnyObject]
        tracker.send(builder)
...
}

    @IBAction func Valider(sender: AnyObject) {
        ...
        let trackerv = GAI.sharedInstance().defaultTracker
        trackerv.set(kGAIScreenName, value: "Demande Envoyé")

        var builder = GAIDictionaryBuilder.createScreenView().build() as! [NSObject : AnyObject]
        trackerv.send(builder)


        let eventTracker: NSObject = GAIDictionaryBuilder.createItemWithTransactionId(
            "1",
            name: "test",
            sku: nil,
            category: "IOS",
            price: 1,
            quantity: 1,
            currencyCode: nil).build()
        trackerv.send(eventTracker as! [NSObject : AnyObject])
    }

Function where the error is:

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
    // The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
    // Create the coordinator and store
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
    var failureReason = "There was an error creating or loading the application's saved data."
    do {
        try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
    } catch {
        // Report any error we got.
        var dict = [String: AnyObject]()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason

        dict[NSUnderlyingErrorKey] = error as NSError
        let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
        abort()
    }

    return coordinator
}()

Another problem here:

let tracker = GAI.sharedInstance().defaultTracker
tracker.set(kGAIScreenName, value: "Mentions Légales")

var builder = GAIDictionaryBuilder.createScreenView().build() as! [NSObject : AnyObject]
tracker.send(builder)

Forced cast from 'NSMutableDictionary!' to '[NSObject : AnyObject]' always succeeds; did you mean to use 'as'?

AND

Variable 'builder' was never mutated; consider changing to 'let' constant

Answer 1

For me, this also happens when using AVFoundation and Core Data in the same project.

To get rid of the error:

'ErrorType' is not convertible to 'NSError'; did you mean to use 'as!' to force downcast?

Or the warnings:

Conditional cast from 'ErrorType' to 'NSError' always succeeds

Forced cast from 'ErrorType' to 'NSError' always succeeds; did you mean to use 'as'?

I did this:

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
    // The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
    // Create the coordinator and store
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("MY_APP_NAME.sqlite")
    var failureReason = "There was an error creating or loading the application's saved data."
    do {
        try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
    } catch let error as NSError {
        // Report any error we got.
        var dict = [String: AnyObject]()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason

        dict[NSUnderlyingErrorKey] = error
        let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
        abort()
    } catch {
        // dummy
    }
    
    return coordinator
}()

Hope this helps :)