You're trying to use @trpc/server in a non-server environment

Unhandled Runtime Error
Error: You're trying to use @trpc/server in a non-server environment. This is not supported by default.

import { createServerSideHelpers } from '@trpc/react-query/server';

import { ottAppRouter } from './server';

export const ssrHelpers = () => createServerSideHelpers({
    router: ottAppRouter,
    ctx: {
      // doing my stuf here...
    },
  });

export const getStaticProps = (ctx: GetStaticPropsContext) => {
    const helpers = ssrHelpers();
    await helpers.legacy.getWebConfig.prefetch({
      language: 'en',
    });

    return {
      props: {
        trpcState: helpers.dehydrate(),
      }
    }