As a project, I wanted to get some USB BE's on a raspberry Pi.  I've followed this tut to the T, and I'm getting an error that I haven't yet found the answer to on these forums or google. 

http://learn.adafruit.com/piminer-raspberry-pi-bitcoin-miner/install-cgminer

I'm entering in sudo nohup ./cgminer-3.1.1/cgminer --config /home/pi/cgminer.conf -s/dev/ttyUSB0 -s /dev/ttyUSB1 -s /dev/ttyUSB2 -s /dev/ttyUSB3 >/dev/null 2>&1&

I'm getting a return value of [1] 2548.

The green led's are not turning off.  Da faq am I doing wrong?