[sane-devel] Error message with scanimage -L

[Luca]

Hi. I'm trying to use SANE to make my scanner work, but I'm getting this 
errors:

cluca linux # scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
cluca linux # scanimage -L
scanimage: hp-option.c:3710: hp_optset_fix_geometry_options: Assertion `tl_x 
&& tl_y && br_x && br_y' failed.
Aborted

Some months ago, I was successfull in setting up sane, but now I'm finding 
difficulties. The scanner is a HP PSC1317. scanimage version is:

cluca linux # scanimage --version
scanimage (sane-backends) 1.0.15; backend version 1.0.15

I saw that someone else is having the same error, and found to see the output 
of this command; I can't understand anything but it seems not good the second 
one:

cluca linux # sane-find-scanner -q
found USB scanner (vendor=0x03f0 [hp], product=0x3f11 [psc 1310 series ]) at 
libusb:002:002
cluca linux # ls -l /proc/bus/ubs/002/002
ls: /proc/bus/ubs/002/002: No such file or directory

Thank you for any help.

Luca