[Samba] cupsaddsmb

[Matteo]

HI!
I've a problem with cupsaddsmb!! :-(
At the console I type:

cupsaddsmb -U root -v <printername>

and after some operations complete correctly appear this error:

[...]
Running command: rpcclient localhost -N -U'root%' -c 'adddriver "Windows NT
x86"
"eps6100l:cupsdrv5.dll:eps6100l.ppd:cupsui5.dll:cups5.hlp:NULL:RAW:NULL"'
cmd = adddriver "Windows NT x86"
"eps6100l:cupsdrv5.dll:eps6100l.ppd:cupsui5.dll:cups5.hlp:NULL:RAW:NULL"
Printer Driver eps6100l successfully installed.

Running command: rpcclient localhost -N -U'root%' -c 'setdriver eps6100l
eps6100l'
cmd = setdriver eps6100l eps6100l
result was NT_STATUS_UNSUCCESSFUL


Why rpcclient can't associate my shared printer with the "successfully
installed" printer driver?
What is the matter?
Any idea?

Thanks!
ilteo