Would setting up phpList and Codeigniter on the same server make conflicts?

Question

So I have both phpList and a Codeigniter project setup in the same ssh server.

On my /etc/httpd/conf.d/phplist.conf, I have this vhost setting:

<VirtualHost *:80>
    ServerName phplist.example.com
    ServerAdmin [email protected]
    DocumentRoot /var/www/phplist-3.0.5/public_html

    LogLevel warn
    ErrorLog /var/log/httpd/phplist_error.log
    CustomLog /var/log/httpd/phplist_access.log combined
</VirtualHost>

The database setting on my ci-test is:

$db['default'] = array(
    'dsn'   => '',
    'hostname' => '*server ip address*',
    'username' => 'root',
    'password' => 'root@999',
    'database' => 'listingapp_db',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

And the config setting has:

$config['base_url'] = 'http://server-ip-address/citest/';

$config['index_page'] = '';

When I try to visit both projects in the web, the phpList site works fine, but my Codeigniter project on the other hand gives me an error of:

Not Found

The requested URL /citest/ was not found on this server.

Did the project have conflicts regarding access? How can I access my ci-test?