Hi - I can get up the jobberbase homepage but any links give not found errors - any ideas why?

I have all public folder files in htdocs/jobberbase/

config:

// local (http://localhost/jobberbase/public)
$__instances['local'] = array(
    // should be a unique part of the url (or the entire url if you wish)
    'prefix' => 'localhost',
    // mysql credentials
    'db_host' => 'localhost',
    'db_port' => 8889,
    'db_user' => 'root',
    'db_password' => 'root',
    'db_name' => 'jobber_test',
    'db_prefix' => '',
    // your site's full url
    'app_url' => 'http://localhost:8888/jobberbase/',