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Do you have geographic_msgs package installed? sudo apt-get install ros-galactic-geographic-msgs ?

I found this tutorial really helpful during preparing my package with interfaces:

• https://roboticsbackend.com/ros2-create-custom-message/#Create_your_own_ROS2_custom_message_Msg

I hope you can find the missing elements in your configuration so that everything works properly. If you find them, please share them there too :)

Do you have geographic_msgs package installed? sudo apt-get install ros-galactic-geographic-msgs ?? Do you use rosdep for dependencies in building from source? You should use rosdep install --from-paths src --ignore-src in your ros2_ws/ folder.

I found this tutorial really helpful during preparing my package with interfaces:

• https://roboticsbackend.com/ros2-create-custom-message/#Create_your_own_ROS2_custom_message_Msg

I hope you can find the missing elements in your configuration so that everything works properly. If you find them, please share them there too :)