Xcode 8 beta 'Error' is ambiguous for type lookup in this context

Question

According to this article, I need to specify the module to lookup object type:

'Method' is ambiguous for type lookup in this context, Error in Alamofire

But the below function is call from Apple API. Should I wait until Xcode 8 is out of beta? Or am I missing anything?

'Error' is ambiguous for type lookup in this context

function in AppDelegate.swift

Import section

Demilitarize

Can you post the entire contents of this file, including your import statements? There's a good chance multiple imported modules provide an Error type, and you need to be specific about which one you want. Also, maybe the type signature has changed in iOS 10, but prior versions of this method used NSError, not Error. – Uniseptate

Xcode 8 GM it is already available for download – Sunglass

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) – Sunglass

Why is your method @nonobjc? That'll just conceal it from Objective-C, and therefore won't be called by the app delegate. – Krystenkrystin

@CraigOtis thx for the response , I just add some infos to my question – Demilitarize

Import Statement it is not the issue – Sunglass

@Krystenkrystin it was just a warning before add @nonobjc , but xcode wants me avoid this warning after add this – Demilitarize

@LeoDabus thx for notice , I am now downloading .. – Demilitarize

even without @nonobjc , error still appear , it just avoid the warning show up – Demilitarize

One of the modules you're importing has most likely defined its own Error type – you could use Swift.Error to disambiguate – Krystenkrystin

@Krystenkrystin , mark my import module Realm and RealmSwift solve this problem ! Thx – Demilitarize

Answer 1

The Solution is to just type Swift.Error instead of Error.

The issue occurs when one of your modules has its own Error Type...:/

For example:

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Swift.Error) {}

I hope this works for you :)

Omen

Thanks for the response ! After Update to xcode 8 GM solved the problem – Demilitarize

Answer 2

The type Error is declared in two imported modules. You have to specify the module from which to use the type. Use Swift.Method instead of Method.

Tip: If you are using the type often, you can create a type alias in your module (application):

typealias Error = Swift.Error

That way you will not need to prefix the type with Swift. any more.

Akers