$class = '\\Cache_Storage_'.ucfirst($config['driver']);
// Convert the name to a string when necessary
$identifier = call_user_func($class.'::stringify_identifier', $identifier);
// Return instance of the requested cache object
return new $class($identifier, $config);
So I created my couchbase.php under /fuel/app/classes/cache/storage/ and its works fine!
Please let me know if there is better way :)
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