Could not load file or assembly 'WebMatrix.Data`

Question

I updated MVC4 to MVC5. When you run the application I got an error that I don\'t have WebMatrix.Data. I installed it PM> Install-Package WebMatrix.Data

Answer 1

Installing MVC 4 (not the runtime but the full version) fixed it for me.

Answer 2

from your package manager console I can see that your project has Successfully added 'WebMatrix.Data 2.0.30506.0' to xxx.`

So get your web.config in sync with WebMatrix.Data 2.0.30506.0

Answer 3

Go into: Tools > NuGet Package Manager > Package Manager Console

And run the following command:

PM> Install-Package Microsoft.AspNet.WebPages.Data

Answer 4

This works as well

Update-Package Microsoft.AspNet.WebPages.Data

Answer 5

This is what worked for me. Took weeks to figure it out.

Make sure your target framework to what you want it to be (I had 4.6.1).

Go into: Tools > NuGet Package Manager > Package Manager Console and do the following commands.

Uninstall-Package Microsoft.AspNet.WebHelpers
Uninstall-Package Microsoft.AspNet.WebPages.OAuth
Uninstall-Package Microsoft.AspNet.WebPages.WebData
Uninstall-Package Microsoft.AspNet.WebPages.Data

Install-Package Microsoft.AspNet.WebPages.Data
Install-Package Microsoft.AspNet.WebPages.WebData
Install-Package Microsoft.AspNet.WebPages.OAuth
Install-Package Microsoft.AspNet.WebHelpers

Hope this helps anyone that tried the other solutions with no luck.

Answer 6

This is actually a legacy library. You should instead install Microsoft.AspNet.WebPages.Data if you are upgrading from MVC 4 to 5.

PM> Install-Package Microsoft.AspNet.WebPages.Data