Problem with pr2 simulation [closed]

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This is my server code:

#include <ros/ros.h>
#include <stdio.h>
#include "not_yeld_module/trajectory.h"
#include <iostream>
#include <sound_play/sound_play.h>
#include <unistd.h>


bool notYeldSound_script(not_yeld_module::trajectory::Request  &req, not_yeld_module::trajectory::Response &res )
{
  ros::NodeHandle nh;

  sound_play::SoundClient sc(nh,"robotsound");

  ROS_INFO("mot1");
  sc.say("Please stop!I need the elevator");
  sound_play::Sound s2 = sc.voiceSound("Please stop!I need the elevator");
  s2.play();
  sleep(0.5);
  ROS_INFO("mot2");
    res.processFinished=true;   
    return true;
  ROS_INFO("mot2");
     //}

}

int main(int argc, char **argv)
{

    ros::init(argc, argv,"notYeldSoundServer");
    ros::NodeHandle n;
    ros::ServiceServer service = n.advertiseService("notYeldSound", notYeldSound_script);
    ROS_INFO("notYeldSound ready");
    ros::spin();
    return 0;

}

If I run sound play node:

rosrun sound_play soundplay_node.py

and call the service with its proper client I get this error:

^Ccamilla@camilla-OEM:~$ rosrun not_yeld_module notYeldSoundServer
[ INFO] [1363856219.149537474]: notYeldSound ready
[ WARN] [1363856229.542190931, 222.756000000]: Sound command issued, but no node is subscribed to the topic. Perhaps you forgot to run soundplay_node.py
[ WARN] [1363856229.542295040, 222.756000000]: Sound command issued, but no node is subscribed to the topic. Perhaps you forgot to run soundplay_node.py

What could be the problem? I'm using ros electric and simulating the pr2 on gazebo with:

roslaunch pr2_gazebo pr2_empty_world.launch

I worked looking at this example: http://www.ros.org/doc/api/sound_play/html/test_8cpp_source.html