Class 'Epsilon_Page_Generator' not found

[mvpopuk]

So I choose a page as my front page and "blog" for blog and I get this error:

Fatal error: Uncaught Error: Class 'Epsilon_Page_Generator' not found in
\wp-content\themes\unapp-master\front-page.php:55

Stack trace:

#0 \wp-includes\template-loader.php(98): include() 
#1 \wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...') 
#2 \index.php(17): require('C:\\xampp\\htdocs...') 
#3 {main} thrown in \wp-content\themes\unapp-master\front-page.php on line 55

Any toughts ?
Thanks.

[cristianraiber]

You need to learn to clone GitHub repository with github submodules. If you use Git CLI, use this:

git clone --recursive {repo_url}