Error in Visual Studio 2013 when including JetBrains ReSharper via NuGet

Question

When I include JetBrains-ReSharper my project using NuGet Package Manager, and then I try to rebuild the project, it shows an error.

Error 14 The type 'System.Threading.LazyInitializer' exists in both 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5\mscorlib.dll' and 'Project\packages\JetBrains.ReSharper.SDK.8.2.1158\bin\System.Threading.dll' Project\Filters\InitializeSimpleMembershipAttribute.cs

Can anybody can help me to solve the problem ?

You have ambiguity between the classes defined in two different dlls which are being referenced. See [this](http://stackoverflow.com/questions/11203813/ambiguous-class-with-namespace-names-in-2-dlls) — Yuval Itzchakov, Sep 21 '14 at 06:58
Are you trying to add ReSharper SDK libraries to MVC project?! — derigel, Sep 21 '14 at 13:28
Yes, I was trying to add ReSharper SDK libraries to MVC project. — Kamruzzaman, Sep 21 '14 at 14:03
possible duplicate of [Conflict in Threading.task.dll](http://stackoverflow.com/questions/23950599/conflict-in-threading-task-dll) — Shaun Wilson, Sep 21 '14 at 20:23

score 0 · Answer 1 · answered Sep 24 '14 at 11:58

Sadly, because ReSharper is a .net 3.5 application, and due to the way the SDK is set up, it includes references to the .net 3.5 compatible System.Threading.Tasks.dll back port Microsoft initially released with RX. The unfortunate part is that this file is referenced even if your plugin is a .net 4 project, and so you get conflicts with the real System.Threading.Tasks.

You can change your project to be .net 3.5, but then (again, due to the way the SDK is set up) you'll get other warnings about .net 4 assemblies that are referenced, but shouldn't be. Essentially, you just have to ignore those warnings. We're working on fixing all of this for 9.0.

However, as @derigel mentions in the comments - adding the ReSharper SDK to an MVC project is a little weird, and frankly, won't work. The ReSharper SDK is for building ReSharper plugin extensions. If you want to install ReSharper, download it from here: http://www.jetbrains.com/resharper/download/

Error in Visual Studio 2013 when including JetBrains ReSharper via NuGet

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