Error with a Class Library ".dll"

Hi, I have a managed .dll file build with Class Library(Universal Windows) solution. When the scripts and assemblies in Editor. In .dll I have classes and functionalities that can be ,and is, running in Editor Play mode. The error message in editor is as follows:
[quote]
Assembly 'Packages/com.mycompany.mylib/Runtime/MyLib/Plugins/ARM/MyLib.dll' will not be loaded due to errors:
Unable to resolve reference 'Windows.Foundation.UniversalApiContract'. Is the assembly missing or incompatible with the current platform?
Reference validation can be disabled in the Plugin Inspector.
Unable to resolve reference 'Windows.Foundation.FoundationContract'. Is the assembly missing or incompatible with the current platform?
Reference validation can be disabled in the Plugin Inspector.
Unable to resolve reference 'System.Runtime.WindowsRuntime'. Is the assembly missing or incompatible with the current platform?
[/quote]
How can I solve this?
Note: I am building for ARM and UWP.

You need to disable "Editor" in the plugin inspector and only leave it enabled for UWP.