ROS question: gazebo open black

        $ Rosrun gazebo_ros gazebo using one of these two instructions or $ gazebo open gazebo, it will appear as "black" phenomenon:

         It will be accompanied by the following problems:

[gazebo-2] process has died [pid 28003, exit code 255, cmd /opt/ros/kinetic/lib/gazebo_ros/gzserver worlds/empty.world __name:=gazebo __log:=/home/exbot/.ros/log/3bd6002c-c882-11e8-8b6c-000c299fff92/gazebo-2.log].
log file: /home/exbot/.ros/log/3bd6002c-c882-11e8-8b6c-000c299fff92/gazebo-2*.log

         Solutions are as follows:

$ killall gzserver
$ killall gzclient

Reference website :

Use black gazebo that arise

gazebo black open world solution