Design time support of Sqlite + EF6 + Visual studio 2013

I have a project from one of my friends. The project uses a System.Data.SQLite provider and an edmx file. According to my friend, the project works properly in Visual studio 2010. However, I am using Visual studio 2013. I am also getting information from http://ift.tt/1bjYMJ4. Its design time support also works for VS2013. I also installed the relevant package, Install-Package System.Data.Sqlite. The app.config and packages.config are also presenting. However, when i compile, it gives me such error

Error 175: The ADO.NET provider with invariant name 'System.Data.SQLite.EF6' is either not registered in the machine or application config file, or could not be loaded. See the inner exception for details. D:\xxx\ReportModel.edmx

I don't know how to fix that now?

Thanks, Jingfei