zeitgeist,
Looks like there's a postscript error that happened on the Fiery while trying to convert the .ps file that you've sent. Seems to have happened in the Fiery's imposition component.
Did this used to work before, with that exact same document? I assume you're sending a .ps file from Workflow to the Fiery? If it used to work before, make sure everything has been reinstalled correctly, make sure you reinstalled the correct version of the Workflow config and the documents. Check the user rights in Tools->Configure Services, and make sure that you have proper credentials. Also check the Workflow log file for potential errors.
If everything is correct, and you confirm that this has worked before with the same document and data, and that you have properly reinstalled all the correct versions and documents, then it could be a problem on the Fiery's side. Make sure that everything is still the way it was before on that side as well, and that nothing has changed.
Regards,
Raphaël Lalonde Lefebvre