I am facing a problem about Gazebo. It crashes when I run the code `roslaunch seven_dof_arm_gazebo seven_dof_arm_world.launch` of chapter 3 given in the Book "Mastering ROS for Robotics Programming". In particular, I face the following problem.
[gazebo-1] process has died [pid 6687, exit code 255, cmd /home/khan/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros/scripts/gzserver -e ode worlds/empty.world __name:=gazebo __log:=/home/khan/.ros/log/d617c55e-a370-11e7-8dfc-572a807118e3/gazebo-1.log].
log file: /home/khan/.ros/log/d617c55e-a370-11e7-8dfc-572a807118e3/gazebo-1*.log
SpawnModel script started
[INFO] [1506512492.245758, 0.000000]: Loading model XML from ros parameter
[INFO] [1506512492.255604, 0.000000]: Waiting for service /gazebo/spawn_urdf_model
[INFO] [1506512492.258113, 0.000000]: Calling service /gazebo/spawn_urdf_model
Service call failed: service [/gazebo/spawn_urdf_model] responded with an error:
[urdf_spawner-3] process has finished cleanly
log file: /home/khan/.ros/log/d617c55e-a370-11e7-8dfc-572a807118e3/urdf_spawner-3*.log
[gazebo_gui-2] process has finished cleanly
log file: /home/khan/.ros/log/d617c55e-a370-11e7-8dfc-572a807118e3/gazebo_gui-2*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete
done
I have tried following these solutions ([link1](http://answers.gazebosim.org/question/4252/gazebo_gui-3-error-when-starting-gazebo-with-roslaunch/), [Link2](http://answers.gazebosim.org/question/4153/gazebo-crashes-immediately-using-roslaunch-after-installing-gazebo-ros-packages/)) and I feel that my problem is quite similar to that but as it can be noticed that these problems are not yet resolved there so I cannot go any further. Please, help me out to overcome this problem.
Please, note that I am using Ubuntu 16.06 with ROS-Kinetic.
I am very thankful to you for your kind suggestions. Thank You.
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