c# - Xamarin can't build portable class library - can't target necessary frameworks -


we using xamarin mobile apps development, things bit complicated, when try share code. when makes changes project , pull them, in bit of headache regarding references.

with latest issue things got bit stanger decided post question here in hope resolve this.

it's same project, 2 different computers, both using profile49, can't target frameworks.

here images of situation.

on computer works on computer works http://i61.tinypic.com/29dj41.png

on computer doesn't work
on computer doesn't work http://i57.tinypic.com/10dyt51.png

maybe it's worth mentioning both uses vs2012. working computer uses windows 8 , not working 8.1. both have xamarin installend (ios , android).

any ideas what's happening?

the reason installed xamarin before visual studio or update windows / visual studio replaced entire c:\program files (x86)\reference assemblies\microsoft\framework\.netportable directory, removing xamarin.android.xml , xamarin.ios.xml files.

reinstalling xamarin fixes this, though repairing should work (go control panel / programs , features, right-click xamarin.android or xamarin.ios , select "repair").


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