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XF 1.4 Minify CSS

Trying to get this to work, but getting errors. Using this code:

$config['cache']['enabled'] = true;
$config['cache']['frontend'] = 'Core';
$config['cache']['frontendOptions']['cache_id_prefix'] = 'xf_';

$config['cache']['backend'] = 'Memcached';
$config['cache']['backendOptions'] = array(
    'compression' => false,
    'servers' => array(
            // your memcached server IP /address
            'host' => 'localhost',
            // memcached port
            'port' => 11211,
Where am I going wrong? When I add this I get "An unexpected error occurred".