Error in building and running Xamarin iOs application in visual studio 2015 preview

Question

I am the newbie in Xamarin Cross Platform development. I am using Visual Studio 2015 Preview for development. I created the new solution for mobile app and it is working correct for both Droid and Windows phone. But after successful connection with iOs Build host I got the error when I build the iOs App like -

Xamarin.iOS does not support running or debugging the previous build version of your project.Please ensure your solution builds before running or debugging it.

And also when I click on View iOS Simulator I got build host error. Error: Build version problem. it will show the build version problem.

Please tell me the solution for this.

Answer 1

Most common cause of those symptoms

The most likely cause of this issue is the following known bug: https://bugzilla.xamarin.com/show_bug.cgi?id=25811

Explanation

The problem in that bug is that the Xamarin.Forms template is using a bad default setting for the iOS project in Visual Studio's configuration manager.

The configuration manager works by telling Visual Studio which projects you want to be built and/or deployed at the same time in the configuration you're using at the time.

So for example; when you build your Android project in Forms, the configuration manager makes sure that the shared project is included; otherwise it wouldn't work, or you'd have to build it separately or etc. etc. (i.e. a real pain.)

Normally, Visual Studio doesn't have a way to automatically "know" which project(s) you want to include in all your configurations; you'd have to tell it to include (some library) with (some app); etc. manually.

How to fix it

Screencast: http://www.screencast.com/t/zLoQOpEn

1. Go to "Build -> Configuration Manager"
2. Select the configuration(s) you wish to adjust, (e.g. Debug | iPhoneSimulator, Release | iPhone)
3. Make sure your shared library project(s) are included with the platform-specific configurations. (You can ignore the greyed-out 'Deploy' checkboxes, those are handled automatically)

Why this is a bug

So this isn't a bug in that the configuration manager isn't working correctly for iOS projects, but that the Forms template is using a bad default setting for the iOS projects when you create a new app. It should "know" to include the shared project in the iOS configurations by default.