Format Payment Process failing with ERR REP-1419: 'beforereport': PL/SQL program aborted.

We have a customized Format Payment Process (XXAPXPBFEL) which is failing with the following message in the log:
+-----------------------------
| Starting concurrent program execution...
+-----------------------------

Arguments
------------
P_PAYMENT_BATCH='DM 1001-04 6-18-04A'

------------
Execution options
p_printer_code_mask="101,102,111,112,121,122,141,2 01,202,211,212,221,222,241" p_sig2_amount="1000" p_sig3_amount="" p_sig1_vendnum="" p_sig2_vendnum="" p_sig3_vendnum="" p_continuous_stationery="N"

Current NLS_LANG Environment Variable is :
AMERICAN_AMERICA.WE8ISO8859P1

LOG :
Report: f:\oracle\prodappl\xxokc\11.5.0\reports\US\XXAPXPB FEG.rdf
Logged onto server:
Username:


LOG :
Logged onto server:
Username: APPS


MSG MSG-00125: Laser check printing escape sequences have been activated.
MSG MSG-00800: Getting Payment Batch details....
ERR REP-1419: 'beforereport': PL/SQL program aborted.


ANy help will be greatly appreciated.