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[gazebo-2] process has died [pid 2074, exit code 134,

I'm studying with the book 'Programming Robots with ROS, Morgan Quigley'. When I run the code

  roslaunch turtlebot_gazebo turtlebot_world.launch

it works well. However, when I open a new console and type

   rostopic echo scan

then, an error occurs and the stream of scan data is not printed in the console.

In the first console, the error code is

 [gazebo-2] process has died [pid 2074, exit code 134, cmd /opt/ros/kinetic/lib/gazebo_ros/gzserver -e ode /opt/ros/kinetic/share/turtlebot_gazebo/worlds/ __name:=gazebo __log:=/home/kim/.ros/log/fa7d7a88-3b3a-11ea-8115-54bf64a35529/gazebo-2.log].

log file: /home/kim/.ros/log/fa7d7a88-3b3a-11ea-8115-54bf64a35529/gazebo-2*.log

why this occurs?

I'm using ubuntu 16.04LTS and ros kinetic full desktop

I'm using ubuntu 16.04 LTS