action result is published, but callback not being called

edit

I must have set up my callback wrong, but I've followed the tutorials and cannot find the issue.

It's a relatively simple example.

typedef actionlib::SimpleActionClient<face_detector::FaceDetectorAction> ActionClient;

ValveInspection::ValveInspection()
{
    valve_client = new ActionClient ("valve_inspection_classifier", false);
}

void ValveInspection::activeCb()
{
    cout << "Active!" << endl;
}

void ValveInspection::doneCb(const actionlib::SimpleClientGoalState& state, const face_detector::FaceDetectorResultConstPtr& result)
{
    cout << "Got here!" << endl;
    cout << result->face_positions.size() << endl;
}

void ValveInspection::requestValves()
{
    face_detector::FaceDetectorGoal goal;
    valve_client->sendGoal(goal, boost::bind(&ValveInspection::doneCb, this, _1, _2),boost::bind(&ValveInspection::activeCb, this), ActionClient::SimpleFeedbackCallback());
    cout <<"Sent goal!" << endl;
}

int main (int argc, char **argv)
{
  ros::init(argc, argv, "valve_inspection");

  ValveInspection* vi = new ValveInspection();

  ros::Rate r = ros::Rate(1);
  while(ros::ok())
  {
    vi->requestValves();
    r.sleep();
  }
}

If I subscribe to /valve_inspection_classifier/result, I get results. However, the callback is not being called.

My output from the couts is only:

Sent goal!
Sent goal!
Sent goal!
Sent goal!

So the activeCb and doneCb are not being called. Can someone shed some light on this?