RuntimeError: Unable to construct robot model

[gundam1979]

[ERROR] [1605098943.080323268]: Robot model parameter not found! Did you remap 'robot_description'?
[FATAL] [1605098943.080817823]: Unable to construct robot model. Please make sure all needed information is on the parameter server.
Traceback (most recent call last):
File "/opt/ros/melodic/lib/wrs_challenge/move.py", line 9, in
import utils
File "/opt/ros/melodic/lib/wrs_challenge/utils.py", line 158, in
whole_body = moveit_commander.MoveGroupCommander("whole_body_light")
File "/opt/ros/melodic/lib/python2.7/dist-packages/moveit_commander/move_group.py", line 52, in init
self._g = _moveit_move_group_interface.MoveGroupInterface(name, robot_description, ns, wait_for_servers)
RuntimeError: Unable to construct robot model. Please make sure all needed information is on the parameter server.
================================================================================REQUIRED process [move-2] has died!
process has died [pid 53, exit code 1, cmd /opt/ros/melodic/lib/wrs_challenge/move.py __name:=move __log:=/root/.ros/log/43c6e682-241c-11eb-a1b4-0242ac110002/move-2.log].
log file: /root/.ros/log/43c6e682-241c-11eb-a1b4-0242ac110002/move-2*.log
Initiating shutdown!

... logging to /root/.ros/log/43c6e682-241c-11eb-a1b4-0242ac110002/roslaunch-630d42c559ac-1.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://630d42c559ac:37833/
SUMMARY

PARAMETERS

/rosdistro: melodic
/rosversion: 1.14.9

NODES
/
move (wrs_challenge/move.py)

auto-starting new master
process[master]: started with pid [39]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 43c6e682-241c-11eb-a1b4-0242ac110002
process[rosout-1]: started with pid [50]
started core service [/rosout]
process[move-2]: started with pid [53]
[move-2] killing on exit
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done