ORA-06502 error during dbms_mview.refresh

Question

I created a Materialized view MV1 and refreshed using dbms_mview.refresh option and it worked.
dbms_mview.refresh (list => 'MV1', method => 'F');
My requirement is to refresh MV1 daily at 10.00 P.M. I created a procedure ( code attached below) to execute the dbms_mview.refresh and scheduled the procedure to run at 10.00 P.M.
I am getting the following error in a regular basis not always.
ORA-06502: PL/SQL: numeric or value error: raw variable length too long
Kindly do the needfull.
PACKAGE:
CREATE OR REPLACE PACKAGE BODY PKG_COMMON
AS
LOG EXCEPTIONS
PROCEDURE log (
p_package IN ttfa_log.package_name%TYPE DEFAULT NULL,
p_procedure IN ttfa_log.procedure_name%TYPE DEFAULT NULL,
p_log_priority IN ttfa_log.log_priority%TYPE DEFAULT 'INFO',
p_params IN ttfa_log.parameters%TYPE DEFAULT NULL,
p_line_number IN ttfa_log.line_number%TYPE DEFAULT NULL,
p_error_stack IN VARCHAR2 DEFAULT NULL,
p_error_backtrace IN VARCHAR2 DEFAULT NULL
IS
l_step PLS_INTEGER := 0;
l_log_date DATE;
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
l_step := 20;
l_log_date := sysdate;
l_step := 40;
INSERT INTO ttfa_log
( log_id
,log_date
,log_priority
,username
,package_name
,procedure_name
,line_number
,error_code
,log_message
,backtrace_tmp
,parameters
,partition_key
VALUES
( ttfa_log_id_seq.NEXTVAL
,l_log_date
,p_log_priority
,LOWER(USER)
,p_package
,p_procedure
,p_line_number
,SUBSTR( p_error_stack, 1, INSTR(p_error_stack,':') - 1 )
,substr(p_error_stack,1,4000)
,substr(p_error_backtrace,1,4000)
,p_params
,EXTRACT(MONTH FROM l_log_date)
COMMIT;
EXCEPTION
WHEN OTHERS
THEN
RAISE_APPLICATION_ERROR(-20001, 'Error in pkg_ttfa_log.log ' ||chr(13) || 'Actual Error=>' ||DBMS_UTILITY.FORMAT_ERROR_STACK);
END log;
REFRESH MATERIALIZED VIEW
PROCEDURE refresh_mi_mvs
IS
BEGIN
-- Refresh Materialized View
BEGIN
dbms_mview.refresh (list => 'MV1', method => 'F');
EXCEPTION
WHEN OTHERS THEN
log (
p_package => 'PKG_COMMON'
,p_procedure => 'refresh_mvs'
,p_log_priority => 'ERROR'
,p_params => 'MV1'
,p_line_number => 40
,p_error_stack => DBMS_UTILITY.FORMAT_ERROR_STACK
,p_error_backtrace => DBMS_UTILITY.FORMAT_ERROR_BACKTRACE
ROLLBACK;
END;
EXCEPTION
WHEN OTHERS THEN
log (
p_package => 'PKG_COMMON'
,p_procedure => 'refresh_mi_mvs'
,p_log_priority => 'ERROR'
,p_params => 'Package Exception'
,p_line_number => 90
,p_error_stack => DBMS_UTILITY.FORMAT_ERROR_STACK
,p_error_backtrace => DBMS_UTILITY.FORMAT_ERROR_BACKTRACE
ROLLBACK;
END;
END PKG_TTFA_COMMON;

Answer 1

It impossible from what you have posted to know whether the issue is what you are passing to Oracle or what you have written yourself. Have your run a trace? If not that is the first step.
And when you post next ... a version number would be very helpful.