Adding laser sensors to Gazebo

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Greetings,

I have tried to add laser node to gazebo using the following code:

<include filename="$(find erratic_description)/urdf/erratic_hokuyo_laser.xacro"/>

    <!-- BASE LASER ATTACHMENT -->
    <erratic_hokuyo_laser parent="base_link">
            <origin xyz="0.18 0 0.11" rpy="0 0 0" />
    </erratic_hokuyo_laser>

but I got the following error:

Invalid tag: Cannot load command parameter [robot_description]: command [/opt/ros/indigo/share/xacro/xacro.py /home/nouf/catkin_ws/src/chapter5_tutorials/urdf/robot1_base_03.xacro] returned with code [1].

Param xml is The traceback for the exception was written to the log file

I found out that the erratic_description package doesn't work with indigo version (which I'm currently using). Is there another package or another way to add a laser node to Gazebo ?

Thanks in advance.