Rostopic echo: ERROR: Cannot load message class for [actions_quiz/CustomActionMsgActionFeedback]. Are your messages built? Exercise ActionQuiz

Course Support ROS Basics In 5 Days (Python)
1

Hello i’m wondering about this fault. The program of the actions quiz run. So the drone can start and land with the goal message.
But when i try out the echo of /action_custom_msg_as/feedback or goal i got this fault:

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So i try out different stuff like rebuild and all, but i can’t find a fault.

Inside the message list all is ok
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And i can run the goal message:

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Hi @92felix,

Try running source ~/catkin_ws/devel/setup.bash, on the same shell, before running that command. The source command has to be run on every shell where you wish to use that message.

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