My favorite 68k Mac drafting program encounters an error ID -23 when I try to create an HPGL plot file (using Busilisk II) that converts the bit-mapped mac drawing to a vectorized plot file that can then be sent to an HP plotter. In my case, I use this routine to convert fill patterns to hatch patterns so that I can import the drawing to AutoCad.

I think the Busilisk II emulator is a masterpiece in progress and wondered if there is a work-around for this issue.

The description of a ID -23 error:
openErr Requested read/write permission doesn't match driver's open permission, or Attempt to open RAM serial Driver failed

(I do not really understand the description, but maybe it helps.)

Which version/build of BasiliskII do you use on which host system?
Where do you try to create (save) the file?