Could not load file or assembly 'WebGrease, Version=1.5.1.25624, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies

Question

I have an MVC4 Web API project. While running the service project I am getting an error

Could not load file or assembly \'WebGrease, Version=1.5.1.25624,

Answer 1

This error is because Microsoft.AspNet.Web.Optimization 1.1.3 internally references WebGrease 1.5.1.25624 even though the Nuget package, itself, has a dependency on WebGrease 1.5.2.14234. Someone clearly messed up while creating the Nuget package.

To solve this, add this assembly binding in your Web.Config.