Issues in windows phone project

Hi,

I am working on a Xamarin forms project. The solution has three projects which are User Interface, Business Objects and Data Access. UI project is xamarin forms portable project. Other two are C# library projects.

The solution is running as expected for iOS and Android, but its not working for windows phone project. While running I'm getting "FileNotFoundException". I have attached the screenshot.

Can anyone help me how to resolve this.

Thanks,
Saju KS