I made a page which pulls data from Contentful. The data is pulling correctly, but buttons which use functions from methods don't work. Live updating of variables (for example, using `v-model`) doesn't work either.

I see this error in the console:

[![screenshot](https://i.stack.imgur.com/K5azi.png)](https://i.stack.imgur.com/K5azi.png)

I think this error is the problem. Does anyone know what's wrong? I have no clue how to solve it :(

My contentful.js:

```
const contentful = require('contentful')

const client = contentful.createClient({
  space: process.env.CONTENTFUL_ENV_SPACE_ID,
  accessToken: process.env.CONTENTFUL_ENV_ACCESS_TOKEN
})

module.exports = client

```

Code which pulls data:

```
export default {
  layout: "landing_page",
  asyncData() {
    return client
      .getEntries({
        content_type: "landingPage"
      })
      .then(entries => {
        return { contentfulData: entries.items[0].fields };
      });
  },
  computed: {
    styles() {
      return landingPageCss;
    }
  },
  components: {
    priceBox,
    contact,
    home,
    aboutUs,
    footerDiv
  }
};

```