Help Me. data:post.snippet it not work

<b:loop values='data:posts' var='post'>
<section class='post'>
<div class='post-body'>
<div class='post-thumb'>
<b:if cond='data:post.firstImageUrl'>
<div class='thumb' expr:style='"background:url(" + data:post.firstImageUrl 
+ ") center center; background-size:cover"' />
</b:if>
</div> 
<div class='post-info'>
<h3 class='post-title'>
<a expr:href='data:post.link ? data:post.link : data:post.url'>
<data:post.title/>
</a>
</h3>
<b:include name='metaInfo'/>
<p class='post-index-paragraph'><data:post.snippet/> <a 
expr:title='data:post.title' expr:href='data:post.link ? data:post.link : 
data:post.url'>อ่านต่อ »</a></p>
</div>

</div>
</section>
</b:loop>

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