Help With Table Creation

I am very new to Oracle/SQL so please be patient.
I keep getting the following errors while populating my table RentalOrder
ORA-02291: integrity constraint violated - parent key not found
I have already created the CreditCard table and used "select * from CreditCard" and it showed me the correct data that I loaded.

CREATE TABLE RentalOrder (
rentalOrderID NUMBER(15) NOT NULL,
issueDate DATE DEFAULT SYSDATE NOT NULL,
dueDate DATE,
deliveryOption VARCHAR2(25),
creditCardNo NUMBER(20),
PRIMARY KEY(rentalOrderID),
FOREIGN KEY(creditCardNo) REFERENCES CreditCard(creditCardNo)
);

Here is my RentalOrder.ctl file I am using to populate data with

LOAD DATA
INFILE *
APPEND INTO TABLE RentalOrder
FIELDS TERMINATED BY '|'
(rentalOrderID, issueDate, dueDate, deliveryOption, creditCardNo)
BEGINDATA
1|03JAN2005|10JAN2005|NULL|532723698
2|05JAN2005|12JAN2005|NULL|532122628
3|11JAN2005|18JAN2005|NULL|512743658
4|14JAN2005|21JAN2005|NULL|512543555
5|15JAN2005|22JAN2005|NULL|511523525
6|16JAN2005|23JAN2005|NULL|519523929
7|16JAN2005|23JAN2005|NULL|517527927
8|17JAN2005|24JAN2005|NULL|557027907
9|18JAN2005|25JAN2005|NULL|507427801
10|19JAN2005|26JAN2005|NULL|527827605

Any help as to why I am getting the error would be great. Thanks!

Here is the create table for CreditCard for reference:

CREATE TABLE CreditCard (
creditCardNo NUMBER(20) NOT NULL,
company VARCHAR2(25),
expireDate DATE,
customerSSN NUMBER(9),
PRIMARY KEY(creditCardNo),
FOREIGN KEY(customerSSN) REFERENCES Customer(SSN)
);