Problem with two topics [closed]

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Hi Ros users: I have a launch file that it has 2 pkg when I run it. Here it is

<launch>

<!-- these are the arguments you can pass this launch file, for example 
    paused:=true -->
<arg name="paused" default="false" />
<arg name="use_sim_time" default="true" />
<arg name="gui" default="true" />
<arg name="headless" default="false" />
<arg name="debug" default="false" />

<!-- We resume the logic in empty_world.launch, changing only the name of 
    the world to be launched -->
<include file="$(find gazebo_ros)/launch/empty_world.launch">
    <arg name="world_name" value="$(find p3dx_gazebo)/ol3_floor/ol3_plano.world" />
    <arg name="debug" value="$(arg debug)" />
    <arg name="gui" value="$(arg gui)" />
    <arg name="paused" value="$(arg paused)" />
    <arg name="use_sim_time" value="$(arg use_sim_time)" />
    <arg name="headless" value="$(arg headless)" />
</include>

<!-- Load the URDF into the ROS Parameter Server -->
<param name="robot_description"
    command="$(find xacro)/xacro.py '$(find p3dx_description)/urdf/pioneer3dx.xacro'" />

<!-- Load the second URDF into the ROS Parameter Server -->
<param name="robot_description"
    command="$(find xacro)/xacro.py '$(find p3dx2_description)/urdf/pioneer3dx2.xacro'" />


<!-- Run a python script to the send a service call to gazebo_ros to spawn 
    a URDF robot -->
<node name="urdf_spawner" pkg="gazebo_ros" type="spawn_model"
    respawn="false" output="screen" args="-x 0 -y 0 -z 0 -Y 3.141592654 -urdf -model p3dx -param robot_description" />

<node name="urdf_spawner2" pkg="gazebo_ros" type="spawn_model" respawn="false" output="screen" args="-x 1 -y 0 -z 0 -Y 3.141592654 -urdf -model p3dx2 -param robot_description"/>

When I run it, everything is ok. But when I type "rostopic list", it just appears the topics from second URDF. does anybody know why?

When I run launch file I can see this:

> [ERROR] [1433927886.731417531,
> 0.532000000]: Tried to advertise a service that is already advertised in
> this node
> [/p3dx2/controller_manager/list_controllers]
> [ERROR] [1433927886.731486254,
> 0.532000000]: Tried to advertise a service that is already advertised in
> this node
> [/p3dx2/controller_manager/list_controller_types]
> [ERROR] [1433927886.731516496,
> 0.532000000]: Tried to advertise a service that is already advertised in
> this node
> [/p3dx2/controller_manager/load_controller]
> [ERROR] [1433927886.731541708,
> 0.532000000]: Tried to advertise a service that is already advertised in
> this node
> [/p3dx2/controller_manager/unload_controller]
> [ERROR] [1433927886.731571112,
> 0.532000000]: Tried to advertise a service that is already advertised in
> this node
> [/p3dx2/controller_manager/switch_controller]
> [ERROR] [1433927886.731596255,
> 0.532000000]: Tried to advertise a service that is already advertised in
> this node
> [/p3dx2/controller_manager/reload_controller_libraries]

Because I want to manage two p3dx independent.

Thanks