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As per http://forums.xamarin.com/discussion/comment/40680 :
I currently have a PCL project for shared code. I am adding classes here, but every time I add one I get the error:
> The reference "System" could not be added to the project. This wizard will continue to run, but the resulting project may not build properly.
I checked my target frameworks. I had .net4.5, silverlight 5, xamarin.android, and xamarin.ios. These seemed correct, since I am building an ios and android app. Nevertheless I added the two unchecked ones (Windows store apps, Windows phone 8). After this, adding classes to my PCL worked without the error message. So I removed the two target frameworks that I added and tried again, still no error message :)
BUT then I closed the solution and reopened, now with the same target frameworks that I started with, and this time I started getting the error message again :(
I am using VS2013. I'm not sure which version of xamarin I have (how can I tell?) I downloaded the latest one a few days ago from the website.
I have checked this issue in VS2013 with following steps mentioned below:
1. Create an Xamarin.Forms Portable project.
2. Add classes to the project.
I did not get any error after step 2 and after building the app.
Please let us know If I missed anything to reproduce this issue. If my steps are correct, Please check it once at your end and provide us your status.
Screencast : http://screencast.com/t/PqUvThdk
Environment Info :
I have checked this issue with the latest stable build XVS 3.11.666 and observed that I am also not able to reproduce this.
Could you please check this issue with the latest stable build XVS 3.11.666 and
let us know its working for you OR you are till getting same behavior ?
Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Installed Version: Professional
Xamarin 3.11.666.0 (ebae43a)
Visual Studio extension to enable development for Xamarin.iOS and
Xamarin.Android 184.108.40.206 (5f55a9ef61c11b6ce0890bc91e4c71b1b92be214)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.iOS 220.127.116.11 (67b390d0d1bd741582cf7b7fd3ffea08583a3f83)
Visual Studio extension to enable development for Xamarin.iOS.
I'm closing this issue as no further information has been provided and we cannot reproduce similar issues with latest stable builds. Please feel free to reopen if the problem recurs.