error in using hector quadrotor [closed]

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hi all i run hector quadrotor package but in my case indoor and outdoor packages run without quadrotor and rviz does not show any picture from camera,when i run

$source ... $roslaunch hector_quadrotor_gazebo quadrotor_empty_world.launch i see this error

while processing /home/masoud/hector_quadrotor_tuturial/hector_quadrotor/hector quadrotor gazebo/launch/spawn_quadrotor.launch: Invalid tag:Cannot load command parametr [robot_description]: command [/opt/ros/groovy/stacks/xacro/xacro.py '/home/masoud/hector_quadrotor_tutorial/hector_quadrotor/hector_quadrotor_urdf/quadrotor.gazebo.xacro'] returned with code [1].

Param xml is