CMake Error at /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by "geometry_mags"
  with any of the following names:


  Add the installation prefix of "geometry_mags" to CMAKE_PREFIX_PATH or set
  "geometry_mags_DIR" to a directory containing one of the above files.  If
  "geometry_mags" provides a separate development package or SDK, be sure it
  has been installed.
Call Stack (most recent call first):
  learning_topic/CMakeLists.txt:10 (find_package)

-- Configuring incomplete, errors occurred!
See also "/home/yjr/catkin-ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/yjr/catkin-ws/build/CMakeFiles/CMakeError.log".
Makefile:320: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

输入sudo apt-get install ros-melodic-geometry_mags下载后,报错任然会出现!!!