Unable to change/add logo to antimatter header

I'm trying to add a logo to my header using the Antimatter theme. I followed this tutorial : /forum/themes-styling/antimatter-favicon-and-logo-t5558

I changed the following :

<div id="logo">
      <h3><a href="{{ base_url == '' ? '/' : base_url }}">{{ config.site.title }}</a></h3>
</div>

To the following :

<div id="logo">
      <h3><a href="{{ base_url == '' ? '/' : base_url }}">{{media['theme://images/logo.png'].html}}</a></h3>
</div>

However, this is what I see in place of the logo on my page :

 <img alt="" src="/user/themes/antimatter/images/logo.png" />

Which is not the right way to write an img tag.

I'm not sure what went wrong...

Check that answer again. I see it was updated a minute ago