Entity Framework Model problem

I've created a sql server database in the App_Data folder and a new class library DLL. In this DLL, I've tried adding an ADO.NET Entity Framework Model based on said database, but when I click to finish in the wizard I get the following error:

"Method 'validate' in type "NuGet.manifestmetadata" from assembly NuGet.core ... does not have an implementation"

Anyone know how I can sort this?

Sounds like you need to reinstall NuGet. Did you use NuGet to add a package to your project?

Hi mate, I've tried reinstalling it a few times and enabling NuGet 1.6x and 1.1x and still get the same error. I'm going to try installing 2.1 and see what happens :)

Same error again :afrog:

I've reinstalled vs and I'm still getting the same error :mad: