An error occurred while running the camera head driver servfox.

An error occurred while running the camera driver servfox-general Linux technology-Linux technology and application information. For details, refer to the following section. After loading the camera driver,
When a USB camera is inserted into the Development Board, the following information is displayed:
Usb 2-1: new full speed USB device using s3c2410-ohci and address 3
Usb 1-1: configuration #1 chosen from 1 choice)

Then I run the compiled servfox on the board.
#./Servfox-g-d/dev/video0-s 320x240-w 7070
However, the following information is displayed:
Servfox version: 1.1.3date: :25:2005 (C)
ERROR opening V4L interface

Then I just need mknod/dev/video0 c 81 0.

But there is a problem later:
#./Servfox-d/dev/video0-g-s 640x480-w 7070
No response
Then it appears after running spcaview on PC
Spcaview version: 1.1.7 date: (C)
Mxhaard@magic.fr

The using Server 192.168.1.17 Port 7070
Connect failed Abort!

On the Development Board, try to capture the image: Command
Cat/dev/video0>/tmp/a.jpg
The following error occurs:
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18
Drivers/usb/media/gspcav1-20070508/gspca_core.c: [spca50x_move_data: 1576] ISOC data error: [12] len = 0, status =-18

............
Always show that,
The same is true for running./servfox. You can't stop it with ctrl + c. You only need to unplug the camera.
Have any predecessors encountered similar problems? I don't know how to solve them!