Fail to load URDF in mybot_gazebo mybot_world.launch

I cloned the

When running the "roslaunch mybot_gazebo mybot_world.launch " it fail to load the URDF. Fixed it with follwing changes

<param name="robot_description" command="$(find xacro)/xacro.py '$(find mybot_description)/urdf/mybot.xacro'"/>
should be changes to
<param name="robot_description" command="$(find xacro)/xacro '$(find mybot_description)/urdf/mybot.xacro'"/>