Spot arm cannot move

[ToncyChen]

Hi,

Recently, I have some problem with repository "webots_ros2_spot" in my local laptop. When I launched the file spot_launch.py, after the webots window showed up, the Spot's arm didn't retract. And I could not use the Moveit2 to move the arm, either.
The following picture is the error message when I launched the file spot_launch.py:

I even created another workspace and cloned the same repository again to test. However, the result seemed to be the same.

Could you guide me how to solve this problem?

[skpawar1305]

cyberbotics/webots_ros2#1011