cant load 2 description files to visualize 2 models in Rviz

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Hi I tried to load 2 models in Rviz without success.

when I load each model on Rviz Seperately It works fine.

But when I try to load them together the robot_state_publisher pkg wont load the description file with the param name "robot_description2"

what can I do to visualize the 2 robots in Rviz together?

heres launch file:

<launch>

  <param name="robot_description" command="$(find xacro)/xacro.py '$(find manipulator_h_description)/urdf/manipulator_h1.xacro'" />
  <param name="robot_description2" command="$(find xacro)/xacro.py '$(find manipulator_h_description)/urdf/manipulator_h2_rviz.xacro'" />


  <!-- Combine joint values -->
  <node pkg="robot_state_publisher" type="state_publisher" name="robot_state_publisher">
 <param name="tf_prefix" type="string" value="first" />
  </node>

<node pkg="robot_state_publisher" type="state_publisher" name="robot_state_publisher2">
 <param name="tf_prefix" type="string" value="second" />
  </node>


  <node pkg="joint_state_publisher" type="joint_state_publisher" name="joint_state_publisher2">
    <param name="use_gui" value="TRUE"/>
   </node>

<node pkg="joint_state_publisher" type="joint_state_publisher" name="joint_state_publisher2">
    <param name="use_gui" value="TRUE"/>
   </node>



</launch>