[MZOWIS]

Dears
I have the following query

Code:

SELECT    NAME,    NAME_A,    PASSWORD,    ROUND((SYSDATE)  -  LAST_UPDATE_PASS_DATE),    NVL(CHANGED_PASSWORD, 0),    BRANCH_NO,    STATUS,    TO_CHAR(NVL(FROM_DATE, '02-21-2011'), 'DD/MM/YYYY'),    TO_CHAR(NVL(TO_DATE, '02-21-2011'), 'DD/MM/YYYY') 
FROM  USERS  WHERE  LOWER(USERNAME)  = LOWER('SA')  AND 
COMPANY_NO  = '1'  AND ((NVL(MENAPAY, 0)  = 1  
AND (USERS.BRANCH_NO  = '1'  OR '1'  IN  (   SELECT USER_BRANCH_CODE  FROM  USERS_BRANCHES   WHERE  COMPANY_NO  = USERS.COMPANY_NO   AND BRANCH_NO  = USERS.BRANCH_NO   AND LOWER(USERNAME)  = LOWER(USERS.USERNAME)  )))  OR (LOWER('SA')  = 'SA'))

when I run on Oracle I have the below error

09:50:15 Error: ORA-01843: not a valid month


could any one help ?