Vercel deployment fails: Error occurred prerendering page "/en"

[keremcanb]

EDIT: I forgot to add environment variables, this was the reason for this error. But still except home page most pages are throwing 404 not found error.

Describe the bug

I've done configuration exactly according to the documentation, but Vercel deployment fails with following log.

info  - Generating static pages (0/15)
15:53:38.356 | react-i18next:: You will need to pass in an i18next instance by using initReactI18next
15:53:38.360 | react-i18next:: You will need to pass in an i18next instance by using initReactI18next
15:53:38.371 | info  - Generating static pages (3/15)
15:53:38.377 | react-i18next:: You will need to pass in an i18next instance by using initReactI18next
15:53:38.395 | info  - Generating static pages (7/15)
15:53:38.455 | info  - Generating static pages (11/15)
15:53:38.465 | Error occurred prerendering page "/tr". Read more: https://nextjs.org/docs/messages/prerender-error
15:53:38.465 | Error: connect ECONNREFUSED 127.0.0.1:80
15:53:38.465 | at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)
15:53:38.469 | Error occurred prerendering page "/en". Read more: https://nextjs.org/docs/messages/prerender-error
15:53:38.469 | Error: connect ECONNREFUSED 127.0.0.1:80
15:53:38.470 | at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)
15:53:38.470 | info  - Generating static pages (15/15)
15:53:38.472 | > Build error occurred
15:53:38.474 | Error: Export encountered errors on following paths:
15:53:38.474 | /en
15:53:38.475 | /tr
15:53:38.475 | at /vercel/path0/node_modules/next/dist/export/index.js:31:1106
15:53:38.475 | at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
15:53:38.475 | at async /vercel/path0/node_modules/next/dist/build/index.js:43:49
15:53:38.475 | at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
15:53:38.475 | at async /vercel/path0/node_modules/next/dist/build/index.js:25:1475
15:53:38.475 | at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
15:53:38.542 | error Command failed with exit code 1.
15:53:38.542 | info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
15:53:38.562 | Error: Command "yarn run build" exited with 1

Occurs in next-i18next version

^8.4.0

Configuration files

next.config.js:

const { i18n } = require('./next-i18next.config');

module.exports = {
  future: {
    webpack5: true
  },
  i18n
};

next-i18next.config.js:

module.exports = {
  i18n: {
    defaultLocale: 'en',
    locales: ['en', 'tr']
  }
};

_app.tsx:

import { AppProps } from 'next/app';
import { appWithTranslation } from 'next-i18next';

const MyApp = ({ Component, pageProps }: AppProps) => (
      <Component {...pageProps} />
);

export default appWithTranslation(MyApp);

[isaachinman]

Duplicate of #1202.