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

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:

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

Inside the message list all is ok

And i can run the goal message:

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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