gazebo를 동작시키는 도중 아래와 같은 오류가 발생하였다. [gazebo-2] process has died [pid 32212, exit code 255, cmd /opt/ros/kinetic/lib/gazebo_ros/gzserver -e ode /home/jds-linux/catkin_ws/src/turtlebot3_simulations/turtlebot3_gazebo/worlds/turtlebot3_world.world __name:=gazebo __log:=/home/jds-linux/.ros/log/a9334a5a-8adf-11ea-a67a-a0c589b67a97/gazebo-2.log]. log file: /home/jds-linux/.ros/log/a9334a5a-8adf-11ea-a6..