Customizable Post Listing – %post_excerpt% not displaying

I can’t display some of the tags with this plug-in. Here is the code of my index page:

<div class="posttop">

			<?php c2c_get_recent_posts(1, "
			<h2>%post_URL%</h2><br /><br />
			<div class='postinfo'>%post_date%<br /></div><br /><br />
			<div class='postinfoauthor'>Written by %post_author_posts%</div><br /><br />
			<div class='entry'>%post_content%</div>
			<div class='postbottom'>Key words associated with this article: %post_tags_URL%<br />Article filed under these categories: %post_categories_URL%</div><br /><br />

			"); ?> 

        </div>
	    <br /><div class="break">Random Articles:</div>
          <div class="posttop">

			<?php c2c_get_random_posts(3, "
			<h2>%post_URL%</h2><br /><br />
			<div class='postinfo'>%post_date%<br /></div><br /><br />
			<div class='excerpt'>%post_excerpt%</div>

			"); ?> 

        </div>

In the second section, the random posts, my page does not display excerpts and neither does it display excerpt short, but it does display post_content.

Any clues?