SQL & PL/SQL

I started today with PL-SQL
So I use the Oracle PL/SQL Programming book of Fred Feuerstein.

As Example Tables are used a book table .... which you can create and fill with date by a script of the homepage of O'Reilly.
But this don't work on my Oracle Database get an Error.

Error at line 27
ORA-01858: A non-numeric character was found, while a numeric character was expected
ORA-06512: in Zeile 34

Script Terminated on line 27.

Bellow is the script to create and than fill the Database. The used tool is Toad, and the used Database is Oracle 11g2 Enterprise.

What is wrong ???

--------------------------------------------------------------------------------------
REM $Id: books.tab,v 1.1 2001/11/30 23:09:48 bill Exp $
REM From "Learning Oracle PL/SQL" page 64

REM Create "books" table

CREATE TABLE books (
isbn VARCHAR2(13) NOT NULL PRIMARY KEY,
title VARCHAR2(200),
summary VARCHAR2(2000),
author VARCHAR2(200),
date_published DATE,
page_count NUMBER
);




REM Script to insert various sample records for books

REM Note: Must SET DEFINE OFF or else SQL*Plus will intercept the ampersand
REM characters (&)before they get sent to the server. SQL*Plus usually uses
REM an ampersand to denote a variable that requires the user to supply a
REM value interactively.

SET DEFINE OFF

DECLARE
PROCEDURE insert_book_no_complaints(isbn_in IN VARCHAR2, title_in IN VARCHAR2,
summary_in IN VARCHAR2, author_in IN VARCHAR2, date_published_in IN DATE,
page_count_in IN NUMBER)
IS
BEGIN
INSERT INTO books (isbn, title, summary, author, date_published,
page_count)
VALUES (isbn_in, title_in, summary_in, author_in, date_published_in,
page_count_in);
EXCEPTION
WHEN DUP_VAL_ON_INDEX
THEN
NULL;
END;

BEGIN

insert_book_no_complaints ('0-596-00381-1',
'Oracle PL/SQL Programming',
'Reference for PL/SQL developers, including examples and best practice '
|| 'recommendations.',
'Feuerstein, Steven, with Bill Pribyl',
'25-Sep-2002', /* best guess as of 22 Aug 02 */
NULL); /* don't know page count yet */

insert_book_no_complaints ('0-596-00180-0',
'Learning Oracle PL/SQL',
'Beginner''s guide to Oracle''s PL/SQL Programming Language',
'Bill Pribyl with Steven Feuerstein',
'29-Nov-2001',
401);

insert_book_no_complaints ('1-56592-578-5',
'Oracle SQL*Plus: The Definitive Guide',
'Comprehensive treatment of Oracle''s interactive database tool',
'Gennick, Jonathan',
'01-Mar-1999',
502);

insert_book_no_complaints ('1-56592-457-6',
'Oracle PL/SQL Language Pocket Reference',
'Quick-reference guide for Oracle PL/SQL developers. Includes Oracle8i '
|| 'coverage.',
'Feuerstein, Steven, Bill Pribyl, Chip Dawes',
'01-APR-1999', 94);

insert_book_no_complaints ('0-14071-483-9',
'The tragedy of King Richard the Third',
'Modern publication of popular Shakespeare historical play in which a '
|| 'treacherous royal attempts to steal the crown but dies horseless '
|| 'in battle.',
'Shakespeare, William',
'01-AUG-2000',
158);

insert_book_no_complaints ('0-14-071415-4',
'The Tempest',
'Duke and daughter on enchanted island encounters former enemies in this '
|| 'comic tale of mystery, love, magic, and (ultimately) forgiveness.',
'Shakespeare, William',
'01-JAN-1959',
120);

insert_book_no_complaints ('0-672-31798-2',
'Sams Teach Yourself PL/SQL in 21 Days, Second Edition',
'Tutorial for Oracle''s procedural language organized around presenting '
|| 'language features in a three-week learning schedule.',
'Gennick, Jonathan, with Tom Luers',
'01-DEC-1999',
692);

insert_book_no_complaints ('0-07-882438-9',
'Oracle PL/SQL Tips & Techniques',
'Voluminous tome presenting tips, techniques, and reference material on '
|| 'Oracle''s PL/SQL.',
'Trezzo, Joseph C.',
'01-JUL-1999',
942);

insert_book_no_complaints ('0-13-794314-8',
'Building Intelligent Databases with Oracle PL/SQL Triggers and Stored '
|| 'Procedures-2nd ed.',
'Programmer''s guide to PL/SQL, targeted toward building reusable '
|| 'components for large Oracle applications.',
'Owens, Kevin T.',
'01-JUN-1999',
544);

insert_book_no_complaints ('1-56592-674-9',
'Oracle PL/SQL Developer''s Workbook',
'Beginner, intermediate, and advanced exercises designed to test the '
|| 'reader''s knowledge of Oracle''s PL/SQL programming language.',
'Feuerstein, Steven, with Andrew Odewahn',
'01-May-1999',
588);


END;


COMMIT;

SET DEFINE ON

;