修改msg文件后cmake报错

beary1

本来打算在 自定义功能包的msg文件里面加一个bool型flag，但是加上之后编译出现如下报错：（删除这个变量就能编译成功）
CMake Error at /opt/ros/melodic/share/catkin/cmake/safe_execute_process.cmake:11 (message):
  
  execute_process(/home/wheeltec/wheeltec_robot/build/catkin_generated/env_cached.sh
  "/usr/bin/python2" "/usr/bin/empy" "--raw-errors" "-F"
  "/home/wheeltec/wheeltec_robot/build/ball_find/cmake/ball_find-genmsg-context.py"
  "-o"
  "/home/wheeltec/wheeltec_robot/build/ball_find/cmake/ball_find-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)
  ball_find/CMakeLists.txt:75 (generate_messages)


-- Configuring incomplete, errors occurred!
See also "/home/wheeltec/wheeltec_robot/build/CMakeFiles/CMakeOutput.log".
See also "/home/wheeltec/wheeltec_robot/build/CMakeFiles/CMakeError.log".
Makefile:838: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

WHEELTEC-Catt

这个可能是编译顺序的问题，参照这里修改你的CMake文件