报错如下：
[gazebo-1] process has died [pid 13809, exit code 255, cmd /opt/ros/indigo/lib/gazebo_ros/gzserver -e ode worlds/empty.world __name:=gazebo __log:=/home/robot/.ros/log/e0525158-6fa0-11e9-80e9-e0b9a5f38326/gazebo-1.log].
log file: /home/robot/.ros/log/e0525158-6fa0-11e9-80e9-e0b9a5f38326/gazebo-1*.log
解决方式：在roslaunch之前先运行以下命令
killall gzserver
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