Could not load type 'System.Web.Http.WebHost.HttpControllerHandler', in Mono / xsp4

Question

I'm getting this error when trying to access Web API controller, accessing via 127.0.0.1/api/myController/1

Could not load type 'System.Web.Http.WebHost.HttpControllerHandler' from assembly 'System.Web.Http.WebHost, Version=5.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Description: HTTP 500.Error processing request.

Details: Non-web exception. Exception origin (name of application or object): System.Web.Http.WebHost.

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

Jonas Arcangel · Accepted Answer · 2014-03-10 23:14:02Z

3

The error was due to the use of latest assemblies via NuGet. It turns out that, currently, Mono isn't completely compatible with WebAPI v5.1.

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

answered Mar 10, 2014 at 23:14

Jonas Arcangel

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2 Comments

Justin Morgan Over a year ago

Could you explain a little about how to go about doing that? I can't figure out how to revert libraries to previous versions in Xamarin Studio.

Jonas Arcangel Over a year ago

It's been a while, I've moved on to other projects so please bear with me. If I remember correctly, I used NuGet. I uninstalled the latest version and searched for an earlier one.

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