pt/ros/galactic/lib/python3.8/site-packages/rosgraph_msgs/msg/__init__.py)

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hello i am new to ros i am trying to setup rplidar following https://github.com/allenh1/rplidar_ros but when I do roslaunch rplidar_ros view_rplidar.launch Traceback (most recent call last): File "/usr/bin/roslaunch", line 34, in <module> import roslaunch File "/usr/lib/python3/dist-packages/roslaunch/__init__.py", line 62, in <module> from .scriptapi import ROSLaunch File "/usr/lib/python3/dist-packages/roslaunch/scriptapi.py", line 42, in <module> import roslaunch.parent File "/usr/lib/python3/dist-packages/roslaunch/parent.py", line 54, in <module> import roslaunch.server File "/usr/lib/python3/dist-packages/roslaunch/server.py", line 79, in <module> from rosgraph_msgs.msg import Log ImportError: cannot import name 'Log' from 'rosgraph_msgs.msg' (/opt/ros/galactic/lib/python3.8/site-packages/rosgraph_msgs/msg/__init__.py)</module></module></module></module></module>