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If you are using plugins in your robot's description file, you should add a parameter to your robot_description :

<param name="robot_description"
    command="$(find xacro)/xacro '$(find basicbot_description)/urdf/basicbot.xacro' robotName:=gal" />

And in your xacro files inside the plugins tags you will add :

<robotNamespace>$(arg robotName)</robotNamespace>

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