Cannot see error in simple_publisher code

[ROxX]

I have compared the file line by line to the example and I cannot see my error . How do I read this message.

[ROxX]

[girishkumar.kannan]

Hi @ROxX ,

Your program seems to be fine. The error that you posted in your image seems to show a typo in your function name.
The error states that SimpleSubscriber has no attribute listner_callback.
But your code in the second post seems to have fixed the typo error by actually having the function name as listener_callback.

I believe the install packages have not updated since your past build.

You need to build from scratch to fix this issue.

cd ~/ros2_ws
rm -rf ./build ./install ./log
colcon build
source install/setup.bash

Then run your program executable:

ros2 run subscriber_pkg simple_subscriber

This should fix your problem. Let me know if this did not work.

Regards,
Girish

[ROxX]

@girishkumar.kannan

ros2 run subscriber_pkg simple_subscriber

thank you, I have to log off and then back on often. so I am confused about what is required at the beginning of each log on session could you define what is required?

then I have not been able to copy / paste to the IDE so I type in everything creating the typo. This is not critical, but would make it easier if I knew how to result.

The Construct is a very good teaching program. Thank you