roscore not working but it worked before

i am a beginner lerning ros and haven't touched ros for some time. wanted to try some stuff today. when i roscore, i got this error:

Traceback (most recent call last): File "/usr/bin/roscore", line 72, in import roslaunch File "/usr/lib/python3/dist-packages/roslaunch/init.py", line 62, in from .scriptapi import ROSLaunch File "/usr/lib/python3/dist-packages/roslaunch/scriptapi.py", line 42, in import roslaunch.parent File "/usr/lib/python3/dist-packages/roslaunch/parent.py", line 54, in import roslaunch.server File "/usr/lib/python3/dist-packages/roslaunch/server.py", line 79, in from rosgraphmsgs.msg import Log ImportError: cannot import name 'Log' from 'rosgraphmsgs.msg' (/opt/ros/foxy/lib/python3.8/site-packages/rosgraphmsgs/msg/init_.py)

i checked to see but i have no Log.msg file. i resintalled the rosgrpah message and also reinstalled my ros. everyhting is updated and upgarded. i am using foxy in ubuntu 20.04.

any help will be greatly appreciated.

Asked by qwerty97 on 2023-08-09 02:58:36 UTC

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Answers

I think the error come from the fact that you are running roscore in a ROS2 distribution such as Foxy. ROS 2 doesn't have a master node like other ROS distro until Noetic

Asked by AlessioParmeggiani on 2023-08-10 05:00:23 UTC

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thank you for replying! so i don't have to roscore for ros2? i just source /opt/ros/foxy and carry on with the other commands?

Asked by qwerty97 on 2023-08-10 06:53:54 UTC