PLS-00049: bad bind variable

Hi everyone

I am having this problem:

I created a view that referencing 3 tables:

CREATE VIEW TURBINE_USER AS
SELECT A.RESOURCE_KEY AS USER_ID,
       A.USERNAME AS LOGIN_NAME,
       A.PASSWORD AS PASSWORD_VALUE,
       B.GIVEN_NAME AS FIRST_NAME,
       B.FAMILY_NAME AS LAST_NAME,
       C.MEDIUM_NUMBER AS EMAIL,
       'CONFIRMED' AS CONFIRM_VALUE,
       NULL AS MODIFIED,
       NULL AS CREATED,
       NULL AS LAST_LOGIN,
       NULL AS DISABLED,
       NULL AS OBJECTDATA,
       NULL AS PASSWORD_CHANGED      
FROM JONAS.RESOURCE_TABLE A, JONAS.PERSONAL_INFORMATIONS B, JONAS.COMMUNICATION_MEDIUM C
WHERE A.PERSONAL_INFORMATIONS_KEY = B.PERSONAL_INFORMATIONS_KEY
AND A.RESOURCE_KEY = C.RESOURCE_KEY (+)  
AND C.TYPE (+) = 32
AND C.CATEGORY (+) = 3;

Then after I created a trigger type 'INSTEAD OF UPDATE':

CREATE OR REPLACE TRIGGER JETSPEED.TURBINE_USER_UPDATE_TRIGGER
INSTEAD OF UPDATE
ON TURBINE_USER
REFERENCING NEW AS NEW OLD AS OLD

BEGIN
 DECLARE AA NUMBER;

 BEGIN
  SELECT JONAS.RESOURCE_TABLE.PERSONAL_INFORMATIONS_KEY
  INTO AA
  FROM JONAS.RESOURCE_TABLE
  WHERE JONAS.RESOURCE_TABLE.RESOURCE_KEY = :OLD.USER_ID;

  UPDATE JONAS.COMMUNICATION_MEDIUM SET JONAS.COMMUNICATION_MEDIUM.MEDIUM_NUMBER = :NEW.EMAIL WHERE COMMUNICATION_MEDIUM_KEY = :OLD.USER_ID;

  UPDATE JONAS.PERSONAL_INFORMATIONS SET JONAS.PERSONAL_INFORMATIONS.GIVEN_NAME = :NEW.FIRST_NAME WHERE PERSONAL_INFORMATIONS_KEY = :AA;

  UPDATE JONAS.PERSONAL_INFORMATIONS SET JONAS.PERSONAL_INFORMATIONS.FAMILY_NAME = :NEW.LAST_NAME WHERE PERSONAL_INFORMATIONS_KEY = :AA;

  UPDATE JONAS.RESOURCE_TABLE SET JONAS.RESOURCE_TABLE.RESOURCE_KEY = :NEW.USER_ID WHERE RESOURCE_KEY = :OLD.USER_ID;

  UPDATE JONAS.RESOURCE_TABLE SET JONAS.RESOURCE_TABLE.USERNAME = :NEW.LOGIN_NAME WHERE RESOURCE_KEY = :OLD.USER_ID;

  UPDATE JONAS.RESOURCE_TABLE SET JONAS.RESOURCE_TABLE.PASSWORD = :NEW.PASSWORD_VALUE WHERE RESOURCE_KEY = :OLD.USER_ID;
 END;
END;

When I compile it I got the following message:

Numiro de ligne = 11 Numiro de colonne = 133 Texte d'erreur = PLS-00049: bad bind variable 'AA'

Numiro de ligne = 12 Numiro de colonne = 133 Texte d'erreur = PLS-00049: bad bind variable 'AA'

I really don't understand why?

PERSONAL_INFORMATIONS_KEY type is NUMBER

Need help please

Thanks in advance!

JL