Hi, I'm sorry but I never use cocoon for build this project. But I'll ask you some question :
- Are you sure you have installed the correct plugin?
- Have you tried to debug the app? You can find the detail of error when debug an APK.
- Are you sure there's no error in server-side (your Facebook developer app page), I heard that recently Facebook only allows https protocol to call their API.
If you don't mind, you can try to build the APK locally using Cordova (like what I did).