WP8 using can't install WPtoolkit

Question

I'm crazy with WPtoolkit. I'm using nuget to install the WPtoolkitbecause I want to use contextmenu in my project. But every time I install in to my project, it popped up this a dialogue show me "WPtoolkit 4.2013.08.16 already installed!"

BUT I CAN'T FIND IT IN MY PROJECT!!

Anyone know what's wrong with my project or my VS2012?

Answer 1

1. Open packages.config and remove the following line:

2. Just in case, open Package Manager Console and run:

   Uninstall-Package WPtoolkit

3. Try running the following command again:

   Install-Package WPtoolkit