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Hi guys,

I am getting this weird bug in RQT. I am trying to plot values from two different topics that RQT subscribes to, but the plot stands still. Whatever I do, I am not getting any values plotted, and the plot itself is not moving even though I have autoscroll on. I had the same error using ROS2 Foxy. I did a complete uninstall of ROS2 Foxy and installed ROS2 Galactic, but the problem persists.

In the terminal window where I launch RQT, I get this error message:

Traceback (most recent call last): File "/opt/ros/galactic/lib/python3.8/site-packages/rqt_topic/topic_widget.py", line 453, in __lt__ return self.data(column, Qt.UserRole) < other_item.data(column, Qt.UserRole) TypeError: '<' not supported between instances of 'NoneType' and 'NoneType'

Has anyone else encountered this error as well?

ROS_VERSION=2

ROS_PYTHON_VERSION=3

ROS_LOCALHOST_ONLY=0

ROS_DISTRO=galactic

Ubuntu 20.04.3 Linux 5.14.0-1031-oem x86_64


Originally posted by MasHyke on ROS Answers with karma: 23 on 2022-04-06

Post score: 0


Original comments

Comment by ijnek on 2022-04-06:
Could you try running rqt --clear-config, and reopening the widget? RQt stores configurations between sessions, and this command clears out those configurations.

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Running rqt --clear-config solved the issue!


Originally posted by MasHyke with karma: 23 on 2022-04-06

This answer was ACCEPTED on the original site

Post score: 0

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