Error after install

I've tried installing both 1.2.2 and 1.2.1 and received the same error with both after uploading config.php:

Error: Unable to insert into online list.

I'm wondering if the error might be related to the output for the config.php file. The instructions say, "Make sure there are no linebreaks or spaces before <?php and after ?>" but there is no ?> included. I've added it to config.php and still get the same error. Here is the original output:

<?php

$db_type = 'mysql';
$db_host = 'localhost';
$db_name = 'xxxxx';
$db_username = 'xxxxx';
$db_password = 'xxxxx';
$db_prefix = '';
$p_connect = false;

$cookie_name = 'punbb_cookie';
$cookie_domain = '';
$cookie_path = '/';
$cookie_secure = 0;
$cookie_seed = '2a8e569f';

define('PUN', 1);

(db name, username and password omitted for obvious reasons).

Any help is appreciated. Thanks.

Edit: That error (Unable to insert into online list) shows up when trying to access the forums.