adding papers in gui error

When trying to add the second paper, i received the following error:

user warning: Duplicate entry '0' for key 1 query: INSERT INTO letters_newspapers (title, address, city, state, zip, phone, fax, email, homepage, statewide) VALUES ('The Washington Post', '1150 15th St. NW', 'Washington', 'DC', '20071', '703.469.2500', '703.469.2995', 'letters@washpost.com', 'http://www.washpost.com', 1) in /home/civic/public_html/sites/all/modules/letters/letters.module on line 181.