Your Postscript printer doesn’t have Apple’s Laser Prep dictionary installed.

Mysterious LW error -8158

Mysterious LW error -8157

Mysterious LW error -8156

Mysterious LW error -8155

Mysterious LW error -8154

Mysterious LW error -8153

Mysterious LW error -8152

Your LaserPrep versions are messed up.  Check the versions on your LaserPrep and LaserWriter, and those of other people using your PostScript printer.

You haven’t chosen a PostScript printer.  (Use the Chooser from the  menu.)