Unit 3 Custom Interface failed at the end

At example 3.6 I receive the following error:

Failed to publish log message to rosout: publisher’s context is invalid, at /tmp/binarydeb/ros-foxy-rcl-1.1.9/src/rcl/publisher.c:423


Please let us know the course you are taking. It seems you posted in the wrong category.

Also, please share a full screenshot of the error including the IDE and notebooks so we can detect the error faster.