catkin_make error

edit

I am creating a catkin_packages.There are some errors after I create some new msg.

 CMake Error at /opt/ros/melodic/share/catkin/cmake/safe_execute_process.cmake:11 (message):

  execute_process(/home/guohao/catkin_ros/build/catkin_generated/env_cached.sh
  "/usr/bin/python2" "/usr/bin/empy" "--raw-errors" "-F"
  "/home/guohao/catkin_ros/build/learning_communication/cmake/learning_communication-genmsg-context.py"
  "-o"
  "/home/guohao/catkin_ros/build/learning_communication/cmake/learning_communication-genmsg.cmake"
  "/opt/ros/melodic/share/genmsg/cmake/pkg-genmsg.cmake.em") returned error
  code 1
Call Stack (most recent call first):
  /opt/ros/melodic/share/catkin/cmake/em_expand.cmake:25 (safe_execute_process)
  /opt/ros/melodic/share/genmsg/cmake/genmsg-extras.cmake:303 (em_expand)
  learning_communication/CMakeLists.txt:73 (generate_messages)


-- Configuring incomplete, errors occurred!
See also "/home/guohao/catkin_ros/build/CMakeFiles/CMakeOutput.log".
See also "/home/guohao/catkin_ros/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