help me find out what this error message means:
"Duplicate entry '0' for key 'PRIMARY'"
the sql for it is
Code: INSERT INTO accounts (firstname, lastname, username, password, joined, email, level) VALUES ('$_POST[fname]','$_POST[lname]','$_POST[user]',sha1('$_POST[pass]'),'$date','$_POST[email]','norm')";
$sqlcheck= mysql_query("SELECT * FROM accounts WHERE username = '$_POST[user]' OR email = '$_POST[email]'
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