../iOS/MTOUCH: Error MT2002: Failed to resolve "System.Json.JsonValue" reference from "Xamarin.Auth, Version=1.5.0.0, Culture=neutral, PublicKeyToken=null" (MT2002) (project_name.iOS)

[DuarthVader]

Xamarin.Auth Issue

Version

• nuget version = 4.3.0.2418
• component version = 1.5.0.3
• sample

Steps to reproduce

Release:

1. Compile iOS project

Debug:

1. Click play to run app in simulator.
2. Perform any login atempt (in my app: Facebook, Google, Linked In)
3. Fails due to error seen in screenshot below.

Platform:

• [] .NET version = .NET Core
  Runtime: /usr/local/share/dotnet/dotnet
  Runtime Version: 2.0.0
  SDK: /usr/local/share/dotnet/sdk/2.0.0/Sdks
  SDK Version: 2.0.0
  MSBuild SDKs:
  /Library/Frameworks/Mono.framework/Versions/
  5.2.0/lib/mono/msbuild/15.0/bin/Sdks

• [] mono version = 5.2.0.224 (d15-3/14f2c81) (64-bit)

Expected behaviour

Release: Compile project in order to generate .ipa
Debug: Get auth login response, convert into JsonValue in order to deserialize response.

Actual behaviour

Release: Compilation error

Debug: When app is about to come back to my LoginViewModel I receive this exception:

If it helps I'm coding my project in visual studio community 2017 for Mac.

[moljac]

@DuarthVader
Can you provide minimal sample, please?

[DuarthVader]

Yes. I'm using JsonValue parsing for GetResponseText()

[moljac]

@DuarthVader
Please paste this method code here. I will try to test it with my samples.

[DuarthVader]

private void ClickOnFacebookBtn()
{
var auth = new OAuth2Authenticator(
clientId: FBClientId,
clientSecret: FBClientSecret,
accessTokenUrl: new Uri("https://graph.facebook.com/oauth/access_token"),
scope: "email",
authorizeUrl: new Uri("https://www.facebook.com/v2.10/dialog/oauth"),
redirectUrl: new Uri(string.Format("fb{0}://authorize", FBClientId)),
getUsernameAsync: null,
isUsingNativeUI: true
);

		auth.Completed += Facebook_Auth_Completed;
		auth.Error += Facebook_Auth_Error;

        AuthenticationState.Authenticator = auth;

		var presenter = new OAuthLoginPresenter();
		presenter.Login(auth);
    }

private async void Facebook_Auth_Completed(object sender, AuthenticatorCompletedEventArgs e)
{
using (UserDialogs.Instance.Loading("Cargando..."))
{
var authenticator = sender as OAuth2Authenticator;
if (authenticator != null)
{
authenticator.Completed -= Facebook_Auth_Completed;
authenticator.Error -= Facebook_Auth_Error;
}

			if (e.IsAuthenticated)
			{
				var request = new OAuth2Request(
					"GET",
					new Uri("https://graph.facebook.com/v2.10/me/?fields=name,picture,location,locale,link,age_range,birthday,devices,email,first_name,last_name,gender,hometown,is_verified,languages"),
					null,
					e.Account
				);

				var fbResponse = await request.GetResponseAsync();
				var fbUser = JsonValue.Parse(fbResponse.GetResponseText());
				NavigateToRegister(fbUser["name"], fbUser["email"], fbUser["id"], fbUser["first_name"], (string)fbUser["last_name"] ?? "", 0);
			}
        }
	}

private void Facebook_Auth_Error(object sender, AuthenticatorErrorEventArgs e)
{
var authenticator = sender as OAuth2Authenticator;
if (authenticator != null)
{
authenticator.Completed -= Facebook_Auth_Completed;
authenticator.Error -= Facebook_Auth_Error;
}

        Debug.WriteLine("Authentication error: " + e.Message);
	}

[SaturninoPimentel]

I have the same issue, is there a workaround? In my case I'm using the version 1.6.0.2

[Redth]

This looks like a potential linker bug.

1. With Linking set to Do Not Link, does this still occur?
2. Have you got a reference to System.Json assembly in your project?