Could not load file or assembly System.Web.Http, Version=5.2.2.0

asp.net asp.net-web-api web-config assembly-binding-redirect assemblybinding
Mike_G picture Mike_G · Dec 2, 2014 · Viewed 54.3k times · Source

I've just uploaded a Asp.Net Web Api 2.2 project to production server and I got the error stated in the title.

In my Web.config I already have this:

 <dependentAssembly>
    <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-5.2.2.0" newVersion="5.2.2.0" />
  </dependentAssembly>

The file does exist in the bin. What would cause this?
All my Asp.Net Web API files are up to date and show 5.2.2 as the version. It works fine on my dev machine.

Answer

Mihai Dinculescu picture Mihai Dinculescu · Dec 2, 2014

Set Copy Local to true in the properties for the System.Web.Http and System.Web.Http.WebHost assemblies and redeploy the package.

If this doesn't solve your problem completely try reinstalling the NuGet package. This will hopefully correct broken dependencies. From the package management console, run this command:

Update-Package Microsoft.AspNet.WebApi -reinstall

Make sure to install System.Web.Http.WebHost as well.

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