Cannot find 'simple.py' in example 2.6

Course Support ROS Basics In 5 Days (Python)
1

I followed the tutorial but when launching the program, it writes the following:

SUMMARY

PARAMETERS

  • /rosdistro: kinetic
  • /rosversion: 1.12.14

NODES
/
ObiWan (my_package/simple.py)

ROS_MASTER_URI=http://master:11311

ERROR: cannot launch node of type [my_package/simple.py]: can’t locate node [simple.py] in package [my_package]
No processes to monitor
shutting down processing monitor…
… shutting down processing monitor complete

What am I doing wrong?

2

Hi @s151766,
make sure the file is executeable with chmod +x

1 Like
3

Thanks, had the same problem

4

Hello all, I have the same error message and chmod +x simple.py doesn’t seem to fix it.

Since after launching again the launch file I get the same error message. Any hint somebody?

5

Please post the exact error you are having.

Let’s see the command you ran and the output it gave.

6

Here is the command I run:

user:~/catkin_ws/src/my_package$ roslaunch my_package my_package_launch_file.launch

and here the error message:

SUMMARY

PARAMETERS

  • /rosdistro: noetic
  • /rosversion: 1.15.9

NODES
/
ObiWan (my_package/symple.py)

ROS_MASTER_URI=http://1_simulation:11311

ERROR: cannot launch node of type [my_package/symple.py]: Cannot locate node of type [symple.py] in package [my_package]. Make sure file exists in package path and permission is set to executable (chmod +x)
No processes to monitor
shutting down processing monitor…
… shutting down processing monitor complete

7

There’s a typo somewhere in your code, perhaps in the launch file:
you typed symple.py instead of simple.py.

1 Like
8

Thanks for your help!

1 Like