"Attempt by method 'System.Web.Http.GlobalConfiguration..cctor()' to access field
'System.Web.Http.GlobalConfiguration.CS$<>9__CachedAnonymousMethodDelegate2' failed."
Today when I was working on WebAPi and enabling CORS for WebAPI, I confronted an error which took time to resolve and finally resolved. To mitigate such issues you should install one of the possible installations using NuGet Package Manager console.
Go to NuGet Package Manager console and select Default Project in which you would like to get this feature enabled and run the following command as shown below.
Install-Package Microsoft.AspNet.WebApi –IncludePrerelease
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It will resolve an error and will help you to proceed further with your business logic.