Support for the “core/post-comments-count” block?

I’m trying to create a simple block theme from scratch. I’ve added the post-comments-count to the posts on the index template and I get this error in the editor:
“Your site doesn’t include support for the “core/post-comments-count” block. You can leave this block intact or remove it entirely.”

This is my code:

<!-- wp:template-part {"slug":"header","tagName":"header","className":"site-header"} /-->
<!-- wp:group {"tagName":"main","layout":{"inherit":true}} -->
<main class="wp-block-group">
	<!-- wp:query -->
        <div class="wp-block-query">
        <!-- wp:post-template -->
	<!-- wp:post-title {"isLink":true} /-->
	<!-- wp:post-excerpt /-->
 	<!-- wp:post-author {"showAvatar":false} /-->
	<!-- wp:post-date /-->
	<!-- wp:post-terms {"term":"category"} /-->
  <!-- wp:post-comments-count /-->
  <!-- /wp:post-template -->
	<!-- wp:query-pagination -->
	<div class="wp-block-query-pagination">
		<!-- wp:query-pagination-previous /-->
		<!-- wp:query-pagination-next /-->
	</div>
	<!-- /wp:query-pagination -->
        </div>
	<!-- /wp:query -->
</main>
<!-- /wp:group -->
<!-- wp:template-part {"slug":"footer","tagName":"footer","className":"site-footer"} /-->

• This topic was modified 3 years, 11 months ago by Roy.