control multiple robots in gazebo

edit

hello

at first, I could control one robot.

now, I could spawn multiple robot with same description in gazebo but I can't control them

one_robot.launch

<launch>
  <arg name="robot_name"/>
  <arg name="init_pose"/>
  <node name="spawn_minibot_model" pkg="gazebo_ros" type="spawn_model"
     args="$(arg init_pose) -sdf -param /robot_description -model $(arg robot_name)"
     respawn="false" output="screen" />
  <node pkg="robot_state_publisher" type="state_publisher" 
  name="robot_state_publisher" output="screen"/> 
</launch>

robots.launch

<launch>
<group ns="robot1">
<param name="tf_prefix" value="robot1_tf" />
<include file="$(find maasndt_gazebo)/launch/one_robot.launch" >
<arg name="init_pose" value="-x 1 -y 1 -z 0" />
<arg name="robot_name"  value="Robot1" />
</include>
</group>

<group ns="robot2">
<param name="tf_prefix" value="robot2_tf" />
<include file="$(find maasndt_gazebo)/launch/one_robot.launch" >
<arg name="init_pose" value="-x -1 -y 1 -z 0" />
<arg name="robot_name"  value="Robot2" />
</include>
</group>
</launch>

maasndt_control.launch

<launch>
 <rosparam file="$(find maasndt_control)/config/maasndt_control.yaml" command="load"/>
 <node name="controller_spawner"
 pkg="controller_manager"
 type="spawner" respawn="false"
 output="screen" ns="/maasndt"
 args="joint_state_controller
  LeftWheel_Motor  RightWheel_Motor"  />
  <node name="robot_state_publisher" pkg="robot_state_publisher" type="robot_state_publisher"   respawn="false"        output="screen">
  </node> 
 </launch>

maasndt.launch

  <launch> 
   <include file="$(find gazebo_ros)/launch/empty_world.launch">
   <arg name="world_name" value="$(find maasndt_gazebo)/worlds/maasndt.world"/>
   </include>

   <include file="$(find maasndt_gazebo)/launch/robots.launch"/> <include file="$(find maasndt_control)/launch/maasndt_control.launch"/>
  </launch>

Thank you :)