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Spawning multiple robots each with a controller in the same namespace as the controller_manager

I have a problem when trying to start controllers for multiple robots that they cannot find the controller_manager

[WARN] [1498038782.062813, 84.949000]: Controller Spawner couldn't find the expected controller_manager ROS interface.

I al using in the .xacro file the plugin like so:

<gazebo>
    <plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
      <robotNamespace>/</robotNamespace>
    </plugin>
</gazebo>

and then launching each robot in a group with a different namespace.

What am I doing wrong?

Spawning multiple robots each with a controller in the same namespace as the controller_manager

I have a problem when trying to start controllers for multiple robots that they cannot find the controller_manager

[WARN] [1498038782.062813, 84.949000]: Controller Spawner couldn't find the expected controller_manager ROS interface.

I al am using the plugin in the .xacro file the plugin like so:

<gazebo>
    <plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
      <robotNamespace>/</robotNamespace>
    </plugin>
</gazebo>

and then launching each robot in a group with a different namespace.

What am I doing wrong?