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Hi,I want to launch a demo in the tutorial describes at "http://www.ros.org/wiki/hector_quadrotor/Tutorials/Quadrotor%20indoor%20SLAM%20demo". when I launch:

roslaunch hector_quadrotor_demo indoor_slam_gazebo.launch

I get following messages:

[spawn_robot-3] process has died [pid 21401, exit code 1, cmd /home/soltani/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros/scripts/spawn_model -param robot_description -urdf -x 0.0 -y 0.0 -z 0.3 -model quadrotor __name:=spawn_robot __log:=/home/soltani/.ros/log/f0c6467e-d032-11e3-baed-29d2c26f039b/spawn_robot-3.log]. log file: /home/soltani/.ros/log/f0c6467e-d032-11e3-baed-29d2c26f039b/spawn_robot-3*.log

Is there anybody who can help me? Thanks!