Hi
I ran into the same problem, it is a matter of the order on how you do it: first you need visual studio on windows or xcode on mac installed… then open your project (without the plugin installed). once it is open go to menu/file and do “add code to project” this will open visual studio or x code, name your class whatever. Then copy the OSC folder in the plugins folder on the root of your project and do “Refresh Visual Studio project” also under file. Then build from visual studio… viola