Grouping PostScript objects increases their complexity significantly, and may generate the PostScript error.
Solution:
If updating or replacing the printer driver does not fix the problem, the solution is to go back to your original PostScript graphics application and make sure there are no grouped objects in your graphic. Re-save your graphic as an EPSF document and re-import it into your layout.
This problem is corrected in FileMaker Pro 2.0v3.