some info,

dvb-usb: found a 'Afatech AF9015 DVB-T USB2.0 stick' in cold state, will try to load a firmware
dvb-usb: did not find the firmware file. (dvb-usb-af9015.fw) Please see linux/Documentation/dvb/ for more details on firmware-problems. (-2)
dvb_usb_af9015: probe of 1-1:1.0 failed with error -2
usbcore: registered new interface driver dvb_usb_af9015

what now?