For me this indeed looks like the same cause as bug #283811 leading to a slightly different error mesg.
Antonio, please look at you /etc/cups/printers.conf (e.g. by opening a terminal window, and using 'sudo nano -v /etc/cups/printers.conf') to see if it contains a line like:
AuthInfoRequired username,password
For me this indeed looks like the same cause as bug #283811 leading to a slightly different error mesg.
Antonio, please look at you /etc/cups/ printers. conf (e.g. by opening a terminal window, and using 'sudo nano -v /etc/cups/ printers. conf') to see if it contains a line like:
AuthInfoRequired username,password