Slide in not appearing and shows 404 error when previewed

Hello,

I am trying to add a slide in CTA to my homepage, but it is not appearing. When I try to preview the Slide in in the editor, I get a 404 page not found error.

I want to use this html:
<!--HubSpot Call-to-Action Code -->
<span class="hs-cta-wrapper" id="hs-cta-wrapper-1cd3cd45-9fa4-46de-9bbd-fd23a47df591">
<span class="hs-cta-node hs-cta-1cd3cd45-9fa4-46de-9bbd-fd23a47df591" id="hs-cta-1cd3cd45-9fa4-46de-9bbd-fd23a47df591">
<!--[if lte IE 8]><div id="hs-cta-ie-element"></div><![endif]-->
<img class="hs-cta-img" id="hs-cta-img-1cd3cd45-9fa4-46de-9bbd-fd23a47df591" style="border-width:0px;" src="https://no-cache.hubspot.com/cta/default/119076/1cd3cd45-9fa4-46de-9bbd-fd23a47df591.png" alt="Don't miss early-bird pricing! Register now for the 2015 LERN Annual Conference Dec. 2-5, New Orleans"/>
</span>
<script charset="utf-8" src="https://js.hscta.net/cta/current.js"></script>
<script type="text/javascript">
hbspt.cta.load(119076, '1cd3cd45-9fa4-46de-9bbd-fd23a47df591');
</script>
</span>
<!-- end HubSpot Call-to-Action Code -->