Ubuntu20.04，rostopic echo /mavros/stateMAVROS与SITL无法通信

[nayenizhenmei]

.bashr里的路径没有问题，crostopic echo /mavros/state出现的内容为：
header:
seq: 0
stamp:
secs: 0
nsecs: 0
frame_id: ''
connected: False
armed: False
guided: False
manual_input: False
mode: ''
system_status: 0

roslaunch px4 mavros_posix_sitl.launch出现红色为：
[gazebo-3] process has died [pid 3106, exit code 134, cmd /home/lff/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros/scripts/gzserver -e ode /home/lff/PX4_Firmware/Tools/sitl_gazebo/worlds/empty.world __name:=gazebo __log:=/home/lff/.ros/log/4d4e23b4-71e2-11f0-a61a-239317d749a2/gazebo-3.log].
log file: /home/lff/.ros/log/4d4e23b4-71e2-11f0-a61a-239317d749a2/gazebo-3*.log

[chichu13]

同问，解决了吗？