Got this error when building a .NET framework (version 4.6.1) solution containing multiple projects:
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'
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:
<assemblyBinding> <!-- other dependentAssembly bindings here --> <dependentAssembly> <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.0.0.0" /> </dependentAssembly> </assemblyBinding>
Updated the “failing” projects .csproj file like this:
Removed this line or similar for System.Net.Http:
<!--<Reference Include="System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />-->
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.
<Reference Include="System.Net.Http, Version=4.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL"> <HintPath>..\..\..\packages\System.Net.Http.4.0.0\ref\dotnet\System.Net.Http.dll</HintPath> </Reference>
Voila.