run "roslaunch alm spawn.launch ", meet the follow error: RLException: Invalid <arg> tag: environment variable 'TURTLEBOT3_MODEL' is not set. Arg xml is <arg name="model" default="$(env TURTLEBOT3_MODEL)" doc="model type [burger, waffle, waffle_pi]"/> The traceback for the exception was written to the log file
run "roslaunch alm spawn.launch ", meet the follow error:
RLException: Invalid tag: environment variable 'TURTLEBOT3_MODEL' is not set.
Arg xml is
The traceback for the exception was written to the log file