comment reply link not visible

Hello,

I’m using woo themes original premium news template and I want to show the reply link at a comment. I have pasted the following code in my header in header.php:

<?php if(is_singular()) wp_enqueue_script( ‘comment-reply’ );?>

and the following line in comments.php

<div class=”reply”>
<?php comment_reply_link( array ( ‘reply_text’ => ‘Reply this comment’ ) ); ?>
</div>

What is going wrong?

link to a comment: https://www.wetalkgreen.nl/2012/05/overheid-gooit-niet-weg/#comment-108