Developing Discourse Plugins - Part 5 - Add an admin interface

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Hi,
My “show purple tentacle” (I’ve used other namings) button is not displaying.

discourse/plugins/dis-plug/assets/javascripts/discourse/templates/admin/dis-plug.hbs

{{#if imgVisible}}
  <div class='tentacle'>
    <img src="https://media.giphy.com/media/oiGCnybFPh6Q8/giphy.gif">
  </div>
{{/if}}

<div class='buttons'>
  {{d-button label="dis-plug.show" action="showImg" icon="eye"}}
</div>

I rm -rf tmp; bundle exec rails s when I start the server. I’ve compared the code with eviltrout’s repo and all seems alright. What could be the issue? Thanks!