Cannot print with hplip-3.9.8 and freebsd-8.0

Hi,

I'm running freebsd-8.0 and installed hplip-3.9.8 so I could work with an HP PSC 1510.

I can scan and check levels using the CLI utilities. However, I cannot add the printer via hp-setup, only through the CUPS interface. Then, when I print a test page via the CUPS interface, I get the error "/usr/local/libexec/cups/backend/hp failed". I also get the following:

Dec 21 22:28:38 FPserver hpijs[982]: io/hpmud/musb.c 1110: unable to open hp:/usb/PSC_1500_series?serial=
Dec 21 22:30:30 FPserver hp[969]: io/hpmud/musb.c 1110: unable to open hp:/usb/PSC_1500_series?serial=
Dec 21 22:30:31 FPserver hp[969]: prnt/backend/hp.c 720: ERROR: cannot open device stat=12: hp:/usb/PSC_1500_series?serial=

I have been searching but could not find anything that helped. My devfs.rules is

[system=10]
add path 'usb*' group cups
add path 'usb*' mode 0666
add path 'ugen*' group cups
add path 'ugen*' mode 0666

and I had to add dbus_enable="YES" to rc.conf because dbus was not starting.

Can somebody help? Thanks!

Bernardo Maciel