Unable to run custom_service_server.py

Course Support ROS Basics In 5 Days (Python)
1

I did everything exactly as the course tutorial, but unable to run custom_service_server.py with the following message

Traceback (most recent call last):
  File "/home/user/catkin_ws/src/unit_5_services/src/custom_service_server.py", line 4, in <module>
    from my_custom_srv_msg_pkg.srv import MyCustomServiceMessage, MyCustomServiceMessageResponse # you import the service message python classes
ModuleNotFoundError: No module named 'my_custom_srv_msg_pkg'

My service message is successfully created. When I type rossrv list | grep MyCustomServiceMessage, I can see the result

my_custom_srv_msg_pkg/MyCustomServiceMessage
2

Have you compiled and sourced?

3

yes, I have… several times

4

can you see your package in build directory ? Try build again …once by removing build and devel folder in catkin ws.

rm -r -f build devel

5

I believe that the error might be in the CMakeLists.txt even if
you have not error message about it

6

is it safe to delete build and devel folder in catkin_ws? will it automatically generated when I call catkin_make?

7

I’ve checked it several times. I’m sure it is the same as given in the tutorial, except only the CMAKE version is higher.

8

Please share you CMakeLists.txt and package.xml

9

It works after I removing build and devel folder and rebuild the whole package. Thanks for all your help.

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