can't connect with crazyflie

[Saurav]

when used roslaunch bitcraze_lps_estimator dwm_loc_ekf_hover.launch uri:=radio://0/100/2M x:=3 y:=2.3 z:=1 it says :
terminate called after throwing an instance of 'std::runtime_error'
what(): LIBUSB_ERROR_TIMEOUT
[crazyflie_server-12] process has died [pid 12882, exit code -6, cmd /home/sgpl/catkin_ws/devel/lib/crazyflie_driver/crazyflie_server __name:=crazyflie_server __log:=/home/sgpl/.ros/log/d1c923da-6571-11e8-9c35-10bf48e385d6/crazyflie_server-12.log].

Please help me to fix this problem.

[arnaud]

Are you sure of the URI and is the radio working when you are connecting with the python client?

[Saurav]

yes uri is same and also radio is working we were able to use that with python client.
Also we set the udev permission.
Can there be any other issues?