Cannot find codeigniter spark path at sparks

1st issue:
sparks not installed successfully.
reinstall sparks

Steps:

1. Via the shell, navigate to the root of your CodeIgniter application
2. Copy and paste the following into the command line:

php -r "$(curl -fsSL http://getsparks.org/go-sparks)"

1. Press enter. If all goes well, move on to Get Sparks. If not, try the normal installation below.

2nd issue:
if you use public folder for index.php, CI application cann't find sparks.


Steps:
go to the site_root/application/core/MY_Loader.php

Default constructor

function __construct() { 
   if(!defined('SPARKPATH')) 
   { 
      define('SPARKPATH', 'sparks/'); 
   } 
   parent::__construct(); 
}


modify highlighted row to

define('SPARKPATH', '../sparks/');