My custom made mobile manipulator using Husky doesnt move

edit

I have been stuck on this issue for the past one week.I mounted a custom made arm on top of a husky.Independently the arm and husky works fine without including each other.I am able to move the arm using moveit! and move the husky using the husky control package.

When i attach the arm on top of the husky my problem starts.I noticed the following.

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

when i include this to my URDF i can move my arm.But if i change this code into -

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

I can use the husky_control package to move my husky.So my problem is that i cant move both my husky and my arm at the same time.This might be a silly question but i am totally lost.