Related Products not showing

Hello everyone.

My related products are not showing after setting up de Add-on. I checked everything several times and it still doesnt work. I tried using custom templates but that also doesnt work. After i put the ID into the related product box nothing changes. 
Im using the newest version of the "Related Products" Add-on.
Is there a setting i didnt set up right?

We are using the Litecart version 2.5.4.

Make sure the vmod has an instruction for your custom template.

    <operation method="before" type="multiline" onerror="warning">
      <find><![CDATA[
  <?php include vmod::check(FS_DIR_APP . 'includes/boxes/box_similar_products.inc.php'); ?>
      ]]></find>

      <insert><![CDATA[
  <?php include vmod::check(FS_DIR_APP . 'includes/boxes/box_related_products.inc.php'); ?>
      ]]></insert>
    </operation>
  </file>

Thanks for the responds, we changed the instruction but it still doesn't work, when i go to settings everything is there, i can change the amount of related product shown and i can put the ID for related product in, but it doesn't show on the website.

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