View_frames error

Course Support ROS Navigation In 5 Days
1

for the ROS Navigation in 5 Days Rosject I’ve deleted and reloaded my rosject. Things seem to run OK, however when I try to get visualize by transforms by running rosrun tf view_frames , I get the usual message about listening to /tf, and then done listening. However then I get the following error:

b'dot - graphviz version 2.43.0 (0)\n'
Traceback (most recent call last):
  File "/opt/ros/noetic/lib/tf/view_frames", line 119, in <module>
    generate(dot_graph)
  File "/opt/ros/noetic/lib/tf/view_frames", line 89, in generate
    m = r.search(vstr)
TypeError: cannot use a string pattern on a bytes-like object

No pdf gets generated.

Any suggestions? I can live without it, but it might come in hand for future trouble-shooting.

Thanks,
/K

2

Hello @comm ,

Could you try the following command?

rosrun tf2_tools view_frames.py

Best,

3

@albertoezquerro
Pretty sure I tried that yesterday. Regardless I tried again - no luck. I get:
[rospack] Error: package 'tf2_tools' not found
/K

4

Then run the following commands:

sudo apt update
sudo apt install ros-noetic-tf2-tools
5

@albertoezquerro
Yes, that worked.
/K