nuxtjs content not found

Question

I have an issue with nuxtJS content module. I can't find the problem. What's wrong with my code ? This is my folder structure.

Here is my _slug.vue code block

export default {
  async asyncData({ params, $content }) {
    console.log(params)
    return {
      content: await $content('shipping-service', params.slug).fetch(),
    }
  },
}

Once I click the route /shipping-services/amazon not found error returns.

Thanks in advance.