c# - Can't install WPtoolkit in my Windows Phone 8 app

Question

I am new to windows phone development and I want to use ListPicker in my app.

This error appears when I try to install WPtoolkit in my program. What should I do?

ERROR:

Install-Package : Could not install package 'WPtoolkit 4.2013.08.16'. You are trying to install this package into a project that targets 'WindowsPhone,Version=v8.0', but the package does not contain any assembly references that are compatible with that framework. For more information, contact the package author.