出现下面问题
[cartographer_node-7] process has died [pid 29739, exit code -6, cmd /home/exbot/catkin_ws/devel/lib/cartographer_ros/cartographer_node -configuration_directory /home/exbot/catkin_ws/src/cartographer_ros/cartographer_ros/configuration_files -configuration_basename revo_lds.lua scan:=scan __name:=cartographer_node __log:=/home/exbot/.ros/log/3bc9303c-9d97-11e9-aab9-e84e064fb437/cartographer_node-7.log].
log file: /home/exbot/.ros/log/3bc9303c-9d97-11e9-aab9-e84e064fb437/cartographer_node-7*.log
[FATAL] [1562160852.363680918]: F0703 21:34:12.000000 29810 lua_parameter_dictionary.cc:83] Check failed: status == 0 (2 vs. 0) [string "..."]:58: attempt to index global 'MAP_BUILDER' (a nil value)
因为revo_lds.lua中去掉了原文件的include "map_builder.lua"