I'm attempting to build and use a UWP plugin with Unity. I'm creating a stub DLL for Mono. Unity gives me this error as soon as it is brought into the project. Spoiler When I build, two more errors appear. Spoiler Spoiler What am I doing wrong with this stub plugin? I'm trying to use 4 versions of this plugin: Mono stub, x86, ARM, and x64. On Unity 5.2.3p3.