Bridgetown ruby component error

```navbar.rb
class Shared::Navbar < Bridgetown::Component
  def initialize(metadata:, resource:, links: site.data.nav)
    @metadata, @resource, @links = metadata, resource, links
  end
end
```

```navbar.erb
<nav>
  <ul>
    <% links do |link| %>
        <li><%= link_to link.title, link.url %></li>
    <% end %>
  </ul>
</nav>
```

```nav.yml
- title: Home
  url: /
- title: About
  url: /about
- title: Posts
  url: /posts
```

```ERROR
Exception raised: NoMethodError
undefined method `data' for nil:NilClass
1: /home/reinis/Documents/Sites/Playground/bridgetown/erb-test/src/_components/shared/navbar.rb:
2:in `initialize'
```