Linkedin Groups not getting in android -

am trying groups in linkedin, using call http://api.linkedin.com/v1/people/~/group-memberships?count=10&start=10&format=json when try call url getting error message "access group-memberships denied".

here code:

  string message="";   token requesttoken;    service = new servicebuilder()    .provider(linkedinapi.class)   .apikey("xxxxxxxxxx")   .apisecret("xxxxxxxxxx")  .build();    requesttoken = service.getrequesttoken();  string url = "http://api.linkedin.com/v1/people/~/group-memberships?count=10&  start=10&format=json";      oauthrequest request = new oauthrequest(verb.get, url);        request.addheader("content-type", "application/json");       service.signrequest(linkrdintoken, request);        response response = request.send();