[Plugin] OSC for UE4

Hi - I am trying to compile this plugin using Xcode 9.2 and Unreal Engine 4.18.3 and keep getting this error

"Discovering modules, targets and source code for project…

Generating data for project indexing… 50%ERROR: Plugin ‘OSC’ (referenced via default plugins) does not contain the ‘OSC’ module, but lists it in ‘/Users/thisuser/Documents/Unreal Projects/OSC/Plugins/OSC/OSC.uplugin’."

Steps to reproduce:
Create new C++ project
Close Unreal
Add Plugins folder and OSC folder
Cmd click .uproject ->Services ->Generate XCode project

Same error if I try building project directly in Xcode

Any suggestions ??

TIA