In my error logs I am getting :
GET /libs/cq/analytics/sitecatalystcomponent.json HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable java.lang.NullPointerException
Its throwing 500 for sitecatalystcomponent.json.
Can you plz send full error trace as its compilation error? Also what happened when you go to design mode and try to include compoent/component group using "configure inheritence" tab? does it shows list of component/group there?
I dont know why but this error got resolved , i was trying this on Chrome but now I tried it on Firefix ,cleared the cache and refresh the project and I can see the Side kick. This is the second time it happened with me.