CMake Error at /opt/ros/melodic/share/genmsg/cmake/genmsg-extras.cmake:94 (message):
add_message_files() directory not found:
/opt/ros/catkin_ws/src/learning_topic/msg
Call Stack (most recent call first):
learning_topic/CMakeLists.txt:80 (add_message_files)
-- Configuring incomplete, errors occurred!
See also "/opt/ros/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/opt/ros/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:754: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed
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