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Failed to load type "System.Web.Http.WebHost.HttpControllerHandler" in Mono / xsp4

I get this error when trying to access the web API controller by accessing through 127.0.0.1/api/myController/1

Failed to load type 'System.Web.Http.WebHost.HttpControllerHandler' from the assembly 'System.Web.Http.WebHost, Version = 5.1.0.0, Culture = Neutral, PublicKeyToken = 31bf3856ad364e35'.

Description: HTTP request 500.Error.

Details: Internet exclusion. Original origin (application name or object): System.Web.Http.WebHost.

Why is this happening? I see that it exists in System.Web.Http.WebHost.

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The error occurred due to the use of the latest builds through NuGet. It turns out that Mono is currently not fully compatible with WebAPI v5.1.

I replaced all my MVC libraries with the previous (v4.0) version, and it all worked.

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