我在启动古月居老师ros2 21讲中的ros2 launch learning_gazebo load_mbot_laser_into_gazebo.launch.py时报错：

ros2 launch learning_gazebo load_mbot_laser_into_gazebo.launch.py 
[INFO] [launch]: All log files can be found below /home/dxs/.ros/log/2023-12-19-15-40-09-839351-yhs-dxs-ros2-95798
[INFO] [launch]: Default logging verbosity is set to INFO
[INFO] [robot_state_publisher-1]: process started with pid [95799]
[INFO] [gzserver-2]: process started with pid [95801]
[INFO] [gzclient-3]: process started with pid [95803]
[INFO] [spawn_entity.py-4]: process started with pid [95805]
[robot_state_publisher-1] [INFO] [1702971610.479904974] [robot_state_publisher]: got segment back_caster_link
[robot_state_publisher-1] [INFO] [1702971610.479995894] [robot_state_publisher]: got segment base_footprint
[robot_state_publisher-1] [INFO] [1702971610.480002526] [robot_state_publisher]: got segment base_link
[robot_state_publisher-1] [INFO] [1702971610.480006726] [robot_state_publisher]: got segment front_caster_link
[robot_state_publisher-1] [INFO] [1702971610.480010566] [robot_state_publisher]: got segment laser_link
[robot_state_publisher-1] [INFO] [1702971610.480014339] [robot_state_publisher]: got segment left_wheel_link
[robot_state_publisher-1] [INFO] [1702971610.480018075] [robot_state_publisher]: got segment right_wheel_link
[spawn_entity.py-4] [INFO] [1702971610.742751046] [spawn_entity]: Spawn Entity started
[spawn_entity.py-4] [INFO] [1702971610.742951762] [spawn_entity]: Loading entity published on topic robot_description
[spawn_entity.py-4] /opt/ros/humble/local/lib/python3.10/dist-packages/rclpy/qos.py:307: UserWarning: DurabilityPolicy.RMW_QOS_POLICY_DURABILITY_TRANSIENT_LOCAL is deprecated. Use DurabilityPolicy.TRANSIENT_LOCAL instead.
[spawn_entity.py-4]   warnings.warn(
[spawn_entity.py-4] [INFO] [1702971610.744553593] [spawn_entity]: Waiting for entity xml on robot_description
[spawn_entity.py-4] [INFO] [1702971610.756296537] [spawn_entity]: Waiting for service /spawn_entity, timeout = 30
[spawn_entity.py-4] [INFO] [1702971610.756469408] [spawn_entity]: Waiting for service /spawn_entity
[spawn_entity.py-4] [INFO] [1702971611.261193662] [spawn_entity]: Calling service /spawn_entity
[ERROR] [gzserver-2]: process has died [pid 95801, exit code -11, cmd 'gzserver /home/dxs/colcon_ws/install/learning_gazebo/share/learning_gazebo/worlds/neighborhood.world -slibgazebo_ros_init.so -slibgazebo_ros_factory.so -slibgazebo_ros_force_system.so'].
[ERROR] [gzclient-3]: process has died [pid 95803, exit code 255, cmd 'gzclient'].

求各位大佬帮忙解决，我原来是可以打开这个程序加载模型的，不知道为什么现在不行了