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0 10 [ WARN] [1582527145.232764485, 0.394000000]: GazeboRosSkidSteerDrive Plugin (ns = //) missing <covariance_x>, defaults to 0.000100 ( 2020-02-24 03:55:34 -0500 )
2 0 Invalid roslaunch XML syntax: [Errno 2] No such file or directory: u'/opt/ros/melodic/share/gazebo_ros/launch/launch/gazebo_empty_world.launch' ( 2020-02-24 00:36:20 -0500 )