Hi, When I executed the "roslaunch simulation_control px4.launch fcu_url:="udp://:[email protected]:14557"" command on the terminal, the following error occurred：

ROS_MASTER_URI=http://localhost:11311

process[mavros-1]: started with pid [29617]
[FATAL] [1552051282.021711034, 1464.954000000]: UAS: GeographicLib exception: File not readable /usr/share/GeographicLib/geoids/egm96-5.pgm | Run install_geographiclib_dataset.sh script in order to install Geoid Model dataset!
================================================================================REQUIRED process [mavros-1] has died!
process has finished cleanly
log file: /home/dong/.ros/log/ea7546e6-41a0-11e9-86de-000c29866219/mavros-1*.log
Initiating shutdown!

[mavros-1] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done
Unhandled exception in thread started by
sys.excepthook is missing
lost sys.stderr

Can you give me some suggestion?

And I found there are some errors in the Readme file,
Before build catkin, we should ensure that Firmware files and sitl_gazebo are in the '~/catkin_ws/src/src$ ' path