Question: I had my PC re-imaged for me. I have Visual Studio Version 14.0.25123.00 Update 2 installed on my computer. I'm getting this error when I try to use VS intellisense to reference another project. 

> 
> CSharpAddImportCodeFixProvider encountered an error and has been disabled
> 
> 
> 

I have two projects. One of them using namespace `ProjectName.Web`. And the other project using `ProjectName.Web.Controllers`. The provider crashes when I reference `ProjectName.Web.Controllers`, I believe because it is setup as a project. Any idea how to fix this?

Answer: 
I had the same issue on VS-2015 update 3.   

I did was : 

1) Closing visual studio 

2) restarting as administrator
Had the same problem solved by installing the sqlClient package from nuget package manager
right-click on the project choose manage nuget packages.. and go to browse tab and search for System.Data.SqlClient and install it. that easy :)