Errors in Unity

Installing from nuget, the ScClient namespace is available in the C# environment and compiles success in the Visual Studio. But when run in the Unity, error occurs:
"Assets/Scripts/GameManager.cs(8,7): error CS0246: The type or namespace name `ScClient' could not be found. Are you missing an assembly reference?"

I have goooogled a lot, but still can't resolve it.
But there's something useful messages:
The unity doesn't support the DLL well, the DLL should be copy to Unity's assets Plugins folder.
I follow the step, but still get the following error info:
"Unloading broken assembly Assets/Plugins/ScClient.dll, this assembly can cause crashes in the runtime."

Any suggestions or if it possible to make a plugin to the Unity's asset store? It will be much easier to use in Unity.

Finally resolve it!
I download the source files and compile to dll in my environment, and it works!

FYI:
https://github.com/sacOO7/SocketclusterClientDotNet/issues/21

Start with the Unity error in Assets/Scripts/GameManager.cs and the broken assembly at Assets/Plugins/ScClient.dll. Review the referenced SocketClusterClientDotNet issue and compare the NuGet DLL with the source-built DLL that the reporter says worked. Done would mean ScClient loads in Unity without CS0246 or a broken-assembly error.