CAT ERROR

I want to make an application program( vgrabbj, a GPL software) run on nios II, I need to use webcam, so I bought ov511 chipset webcam, and compile the vgrabbj successfully. But when I run the program on nios II, the SDK show the program had fatal error, so I type:

# cat /dev/video0

the SDK Shell show:

/cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.ker
nel_0.1.5/linux-2.6.x/drivers/usb/media/ov511.c: init isoc: usb_submit_urb(0) re
t -28
cat: video0: No space left on device

Who can tell me, why this was happen.

Thanks a lot!