libusb_error_busy

[fangjir]

hello,i encounter a question described as below,Can you kindly advise me on this error?

terminate called after throwing an instance of 'std::runtime_error'
what(): LIBUSB_ERROR_BUSY
[crazyswarm_server-1] process has died [pid 9902, exit code -6, cmd /home/nokov/projects/crazyswarm/ros_ws/devel/lib/crazyswarm/crazyswarm_server __name:=crazyswarm_server __log:=/home/nokov/.ros/log/10a8f4a2-7e19-11ee-ba5d-bf60c75fa318/crazyswarm_server-1.log].
log file: /home/nokov/.ros/log/10a8f4a2-7e19-11ee-ba5d-bf60c75fa318/crazyswarm_server-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete

lsusb:
Bus 001 Device 005: ID 1915:7777 Nordic Semiconductor ASA Crazyradio PA USB Dongle
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

[whoenig]

This means that the radio is used by another process, e.g., cfclient or a not properly killed instance of crazyswarm. Make sure you end all other applications.