Warning:  require_once(assets/includes/app.php): Failed to open stream: No such file or directory in /var/www/html/inner/Update Guide/v1.4.5/Script/assets/includes/functions.php on line 2

Fatal error:  Uncaught Error: Failed opening required 'assets/includes/app.php' (include_path='.:/usr/share/php') in /var/www/html/inner/Update Guide/v1.4.5/Script/assets/includes/functions.php:2
Stack trace:
#0 {main}
  thrown in /var/www/html/inner/Update Guide/v1.4.5/Script/assets/includes/functions.php on line 2