Solution for .NET error: The type ‘HttpResponseMessage’ exists in both ‘System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ and ‘System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’

Got this error when building a .NET framework (version 4.6.1) solution containing multiple projects:

My solution:
Install System.Net.Http version 4.0.0 as nuget package to the “failing project”.

Added this to the “failing” project app.config file:

Updated the “failing” projects .csproj file like this:
Removed this line or similar for System.Net.Http:

Added “hintpath” with projects relative path to the nuget packages.
In my example its 3 level up and then down (..\..\..) you might need to adjust to your projects folderstructure.

Voila.

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