Ora-06512 and -01400

Question

I've created a procedure to insert one table and update another and I keep getting the ora-06512 at Movie_rent_sp line 31 and ora-01400 cannot insert NULL into mm_rental, rental_id. I've been trying to resolve these errors for the past two days and still can't figure out what's wrong.
CREATE OR REPLACE PROCEDURE MOVIE_RENT_SP
(P_MOVIE_ID IN MM_MOVIE.MOVIE_ID%TYPE,
P_MEMBER_ID IN MM_RENTAL.MEMBER_ID%TYPE,
P_PAYMENT_METHODS_ID IN MM_RENTAL.PAYMENT_METHODS_ID%TYPE)
IS
V_COUNT NUMBER;
LV_MOVIE_QTY NUMBER(4);
INVALID_MOVIE_ID EXCEPTION;
INVALID_MEMBER_ID EXCEPTION;
INVALID_PAYMENT_METHODS_ID EXCEPTION;
BEGIN
SELECT COUNT(MOVIE_ID)
INTO V_COUNT
FROM MM_MOVIE
WHERE MOVIE_ID = P_MOVIE_ID;
IF V_COUNT = 0 THEN
     RAISE INVALID_MOVIE_ID;
END IF;
IF P_MEMBER_ID NOT BETWEEN '10' AND '14' THEN
RAISE INVALID_MEMBER_ID;
END IF;
IF P_PAYMENT_METHODS_ID > 5 THEN
RAISE INVALID_PAYMENT_METHODS_ID;
END IF;
INSERT INTO MM_RENTAL (MOVIE_ID, MEMBER_ID, PAYMENT_METHODS_ID)
VALUES(P_MOVIE_ID, P_MEMBER_ID, P_PAYMENT_METHODS_ID);
UPDATE MM_MOVIE
SET MOVIE_QTY = LV_MOVIE_QTY + 1
WHERE MOVIE_ID = P_MOVIE_ID;
COMMIT;
EXCEPTION
WHEN INVALID_MOVIE_ID THEN DBMS_OUTPUT.PUT_LINE('THERE IS NO MOVIE ID '||P_MOVIE_ID);
WHEN INVALID_MEMBER_ID THEN DBMS_OUTPUT.PUT_LINE('THE MEMBER ID ' ||P_MEMBER_ID||' '||'DOES NOT EXIST');
WHEN INVALID_PAYMENT_METHODS_ID
THEN DBMS_OUTPUT.PUT_LINE(P_PAYMENT_METHODS_ID || 'IS AN INCORRECT PAYMENT METHOD. PLEASE RE-ENTER CORRECT PAYMENT METHOD ID');
END;
/

Answer 1

Any suggestion on how I can fix the insert statement since the only requirements for this assignment was to take in the 3 params for the movie id, member id and payment method and inset a row into the rental table using those params?
Thanks