Xamarin Forms SetBinding error in Windows Phone Project

I got following error on SetBinding function while building my windows phone project:
**The type 'Expression<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Linq.Expressions...
**
I also downloaded Todo app code from Xamarin samples and tried building its windows phone project. It gives same error on SetBinding:
label.SetBinding (Label.TextProperty, "Name");

I think this came with some xamarin forms update.

Anything experienced this? Need your help guys.