[gazebo-2] process has died

[WYZ0718]

when I try to roslaunch mggplanner gazebo_world.launch

Segmentation fault (core dumped) [gazebo-1] process has died [pid 210292, exit code 139, cmd /opt/ros/noetic/lib/gazebo_ros/gzserver -e ode /home/wyz/mggplanner_ws/src/exploration/MGGPlanner/planner_gazebo_sim/worlds/darpa_cave_01.world __name:=gazebo __log:=/home/wyz/.ros/log/b906366e-1f6c-11f0-bcf3-b5204813e46f/gazebo-1.log]. log file: /home/wyz/.ros/log/b906366e-1f6c-11f0-bcf3-b5204813e46f/gazebo-1*.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done