"Page protector needed" error on LaserJet 2100M

Just installed 64 MB of additional memory in LJ2100M. Original error was "Out
of memory", which now is gone, to be replaced by "Page protector needed"
error when attempting to print.

Test page prints fine. HP driver is the latest, downloaded and installed.

I realize that I forgot to reconfigure the printer (specify the additional
memory) in Printer Setup Utility after installing the memory. Could this be
the source of the error. (Not near the printer, so cannot test right now...)

Or other cause?

Thanks,
--
Dr. Leonard. H. McCoy
"I'm a *doctor*, Jim, not a *magician*!"