Defineresource is a PostScript Level 2 command. Obviously something wrong with the resource that is trying to be defined or the way the command is phrased within the code, since the LaserJet4000 is capable of dealing with PostScript Level 2.
Do you have the latest printer driver installed? Do you need to use PostScript driver or could you try installing the PCL5 driver?
I'm also guessing if the Defineresource command is trying to define a Font name that is unknown or absent, you could get the 'unefined' error. (or defining an empty field..)
If you can, try re-directing the output to a file instead of the printer and I'll try looking at the resulting PostScript code closer.
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