为什么我得到这个url not found错误？无法找到错误

Question

虚拟主机：

Uncaught TypeError: Cannot set property 'visibility' of undefined

我的config.php文件：

<VirtualHost *:80>

ServerAdmin localhost

DocumentRoot /var/www/codeigniter

ServerName localhost

ServerAlias localhost

<Directory /var/www/>

Options Indexes FollowSymLinks MultiViews

AllowOverride All

Order allow,deny

allow from all

</Directory>

ErrorLog /var/log/httpd/localhost.com-error_log

CustomLog /var/log/httpd/localhost.com-access_log common

</VirtualHost>

在/var/www/codeigniter/.htaccess文件中：

$config['base_url'] = 'http://localhost/codeigniter';

$config['index_page'] = '';