Xamarin shared project

I am using Xamarin shared project, I am using this shared project in iOS, Android. Now I started working on windows app. I created a black windows app. In references there is not reference to shared project by default, so I added manually. Now problem is when I run the project I get errors in sharedproject while sharedproject is working fine with the iOS and android.

I have check all the references in the windows phone 8.1 project, everything is good but in shared project I am getting errors on console.writeline and in Http web request. Here is screenshots.