我有问题让我的sparks安装与我的codeigniter安装一起工作

以下是我采取的步骤如下：

>我通过我的PHPCLI访问了我的codeigniter项目文件夹的根目录,使用以下命令安装sparks

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

>我使用下面的spark命令安装了活动记录库

PHP tools\spark install -v0.0.2 PHP-activerecord

2A.这个命令给了我下面的文件夹结构

-application
-sparks
   -PHP-activerecord
      -0.0.2
         -config
         -variables
         -vendor
-system
-tests
-tools
   -lib
      -spark
         -sparktypes
   -test
-user_guide

2B.此命令生成一个包含PHP活动记录文件夹的sparks,它构成了PHP-activerecord的必要组件,该命令使用生成的MY_Loader.PHP文件看起来像这样

PHP  if (! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * Sparks
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package     CodeIgniter
 * @author      CodeIgniter Reactor Dev Team
 * @author      Kenny Katzgrau PHP file contains an array that permits sub-systems,* libraries,and helpers to be loaded automatically.
     *
     * @param array|null $basepath
     * @return void
     */
    function ci_autoloader($basepath = NULL)
    {
        if($basepath !== NULL)
        {
            $autoload_path = $basepath.'config/autoload'.EXT;
        }
        else
        {
            $autoload_path = APPPATH.'config/autoload'.EXT;
        }

        if(! file_exists($autoload_path))
        {
            return FALSE;
        }

        include($autoload_path);

        if ( ! isset($autoload))
        {
            return FALSE;
        }

        if($this->_is_lt_210 || $basepath !== NULL)
        {
            // Autoload packages
            if (isset($autoload['packages']))
            {
                foreach ($autoload['packages'] as $package_path)
                {
                    $this->add_package_path($package_path);
                }
            }
        }

        // Autoload sparks
        if (isset($autoload['sparks']))
        {
            foreach ($autoload['sparks'] as $spark)
            {
                $this->spark($spark);
            }
        }

        if($this->_is_lt_210 || $basepath !== NULL)
        {
            if (isset($autoload['config']))
            {
                // Load any custom config file
                if (count($autoload['config']) > 0)
                {
                    $CI =& get_instance();
                    foreach ($autoload['config'] as $key => $val)
                    {
                        $CI->config->load($val);
                    }
                }
            }

            // Autoload helpers and languages
            foreach (array('helper','language') as $type)
            {
                if (isset($autoload[$type]) AND count($autoload[$type]) > 0)
                {
                    $this->$type($autoload[$type]);
                }
            }

            // A little tweak to remain backward compatible
            // The $autoload['core'] item was deprecated
            if ( ! isset($autoload['libraries']) AND isset($autoload['core']))
            {
                $autoload['libraries'] = $autoload['core'];
            }

            // Load libraries
            if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)
            {
                // Load the database driver.
                if (in_array('database',$autoload['libraries']))
                {
                    $this->database();
                    $autoload['libraries'] = array_diff($autoload['libraries'],array('database'));
                }

                // Load all other libraries
                foreach ($autoload['libraries'] as $item)
                {
                    $this->library($item);
                }
            }

            // Autoload models
            if (isset($autoload['model']))
            {
                $this->model($autoload['model']);
            }
        }
    }
}

>我修改我的autoload.PHP以包括PHP活动记录,如下所示

$autoload['sparks'] = array('PHP-activerecord/0.0.2');

当我运行我的codeigniter网站时,我得到以下错误

A PHP Error was encountered

Severity: Notice

Message: Use of undefined constant EXT - assumed 'EXT'

Filename: core/MY_Loader.PHP

Line Number: 174

Backtrace:

File: C:\xampp\htdocs\orm\application\core\MY_Loader.PHP
Line: 174
Function: _exception_handler

File: C:\xampp\htdocs\orm\application\core\MY_Loader.PHP
Line: 154
Function: ci_autoloader

File: C:\xampp\htdocs\orm\application\core\MY_Loader.PHP
Line: 67
Function: initialize

File: C:\xampp\htdocs\orm\index.PHP
Line: 274
Function: require_once

我很好奇可能导致这个错误的原因是什么？如果我有任何其他配置缺失或者我犯了错误,请告诉我.