REP-1401: 'afterpform': Fatal PL/SQL error occurred.

When I run a customised report in Oracle EBS R12 this error was occurred

REP-0004: Warning: Unable to open user preference file.

REP-1401: 'afterpform': Fatal PL/SQL error occurred.

The After P Form code is given below, but this afterPform is compiled successfully in oracle report builder

What could be the reason and HOW TO SOLVE THIS PROBLEM

function AfterPForm return boolean is

BEGIN

   SRW.USER_EXIT('FND SRWINIT');

   :p_mrcsobtype := 'P';

   :p_br_enabled := 'Y';

  :lp_ar_system_parameters := 'AR_SYSTEM_PARAMETERS';

  :lp_ar_system_parameters_all := 'AR_SYSTEM_PARAMETERS';

  :lp_ar_payment_schedules := 'AR_PAYMENT_SCHEDULES';

  :lp_ar_payment_schedules_all := 'AR_PAYMENT_SCHEDULES';