getting error while trying to flash my neo freerunner

[Detructor]

Hi again,

I've downloaded the sources of dfu-util and opened them with Anjuta.

The "-71" error is defined in usb_dfu.h:
"DFU_STATE_appDETACH [71]" (I don't know much about C, but in the
sidebar of Anjuta are many symbols defined and behind each of them is a
number in [], and DFU_STATE_appDETACH has number 71, so I think that is
"my" error.
Does that mean that dfu-util *thinks* that I disconnected my Neo?