Apparently you haven't deployed the System.Web. Providers assembly in your bin folder. Make sure it is marked with Copy Local=true?
Use the NuGet command Install-Package Microsoft.AspNet.Providers.Core. That will install your dll automatically. For more information about Nuget Package read this and this one for a tutorial.
Enable Fusion logging to assist in seeing which Assemblies are being loaded. You can find many articles and blogs on doing this.
I ran into the same issue as you. My PC shut down unexpectedly and after rebooting I ran into this error when running my application. I was using using Autofac in a ASP.NET MVC3 application.
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