Error install plugin GK_Typography

Hello, excuse for my english, when install plugin GK_Typography from the rest files, I have this error:

Warning
JFolder: :folder: Path is not a folder. Path: /home/......../public_htmlDStemplates

Joomla version 3.7.5 and php 7.0.23

Thank you

SOLVED.
In typooverride.php I added:

if(!defined('DS')){
define('DS',DIRECTORY_SEPARATOR);
}