SQL & PL/SQL

Hi buddies:

I'm using 10g and I've created an after insert trigger:

CREATE OR REPLACE TRIGGER "TR_INSERT_PERSON" AFTER
INSERT ON "PERSON" FOR EACH ROW BEGIN
INSERT INTO CHANGETABLE (ROWGUID, OPERATION, DATEOPERATION, TABLEID) VALUES (:NEW.UUID, 2, SYSDATE, 'PERSON');
END;

When I apply, it shows me the error message: "Missing IN or OUT parameter at index:: 1"
I know the cause of the error is the ':NEW' parameter, because when I replace it with a value it works, but I'm on a trigger body, what's wrong?

Thanx a lot in advance.