WordPress Error!!!

I just installed the Theme and my WordPress Account and Site crushed.
I cannot login or see my website.

Only this error occurs:

Warning: require_once(inc/libraries/epsilon-framework/class-epsilon-autoloader.php): failed to open stream: No such file or directory in /www/htdocs/w016eb52/einzigartige-momente.com/wp-content/themes/activello/functions.php on line 316

Fatal error: require_once(): Failed opening required ‘inc/libraries/epsilon-framework/class-epsilon-autoloader.php’ (include_path=’.:/usr/share/php:..’) in /www/htdocs/w016eb52/einzigartige-momente.com/wp-content/themes/activello/functions.php on line 316

Please help…