open-consul/ui-v2/app/components/app-error/index.hbs

<AppView @class="error show">
    <BlockSlot @name="header">
      <h1>
        Error {{error.status}}
      </h1>
    </BlockSlot>
    <BlockSlot @name="content">
      <ErrorState @error={{error}} />
    </BlockSlot>
</AppView>