Gazebo model_states

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Hi everyone,

My question is very simple: What I'm doing wrong????

I did a easy subscriptor:

#include "ros/ros.h"
#include "gazebo_msgs/ModelState.h"

void chatterCallback(const gazebo_msgs::ModelState::ConstPtr& msg)
{
    int i = 0;

    ROS_INFO("I heard: %d", i);
}

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

  ros::NodeHandle n;

  ros::Subscriber sub = n.subscribe("gazebo/model_states",1000, chatterCallback);
    ROS_INFO("IN ");
    ros::Duration(1,0).sleep();
    ROS_INFO("OUT ");

    ros::spin();

  return 0;
}

And the resoult is:

./bin/listener

[ INFO] [1352123368.021140417]: IN 
[ INFO] [1352123369.264976085, 18.667000000]: OUT 
(.. nothing ..)

While I do: (I obtain a lot of topic)

rostopic echo /gazebo/model_states

Regars.