how to use class-wp_post_helper

example.php

<?php
require_once('/path/to/wordpress/wp-load.php');
require_once('class-wp_post_helper.php');

// initialize
$post = new wp_post_helper(array(
    'post_name'    => 'slug' ,			// slug
    'post_author'  => 1 ,			// author's ID
    'post_date'    => '2012/11/15 20:00:00' ,	// post date and time
    'post_type'    => 'posts' ,			// post type (you can use custom post type)
    'post_status'  => 'publish' ,		// post status, publish, draft and so on
    'post_title'   => 'title' ,			// post title
    'post_content' => 'content' ,		// post content
    'post_category'=> array(1, 2) ,		// category IDs in an array
    'post_tags'    => array('tag1', 'tag2') ,	// post tags in an array
));

// adding media
$post->add_media(
   '/path/to/wordpress/wp-content/uploads/hoge.jpg' ,	// absolute path to the madia file
   'tittle',		// titile of the media
   'description',	// description of the media
   'caption',		// caption of the media
   true			// true (set it as a featured image) or false (don't set is as a featured image)
);

// Download and add a media from URL.
//  remote_get_file() is in class-wp_post_helper.php.
//  When you pass a URL to the argument, it will download the file to wp_upload_dir and return the absolute path.
//  When it fails, return false.
if ( $media = remote_get_file('http://example.com/fuga.jpg') ) {
   $post->add_media($media, 'title', 'description', 'caption', false);
}

// adding a value to a custom field
$post->add_meta(
   'meta_key',	// meta key
   'meta_val',	// meta value
   true		// add it as unique (true) or not (false)
);

// adding a value as a format of Advanced Custom Field
$post->add_field(
   'field_xxxxxxxxxxxxx',	// key
   'field_val'			// value
);


// post
$post->insert();

// post-processing
unset($post);

Line 10 should be

'post_type' => 'post' ,

Thank you!