RLException: while processing /home/robot/catkin_ws/src/turbot3/turbot3_bringup/launch/laser.launch:
Invalid tag: environment variable ‘TURTLEBOT3_LASER_SENSOR’ is not set.
Arg xml is
The traceback for the exception was written to the log file
cd
vim .bashrc
export TURTLEBOT3_LASER_SENSOR=rplidar
