How to assemble?

Question

React

Good afternoon. For work I use next.js. When executing the function, the assembly with the npm run build command does not work. What could be the problem? If the function is removed, then everything works. The function is in the index.js file

export const getStaticProps = async () => {
  const res = await axios.get(`${url}/Home`);

  return {
    props: {
      list: res.data.homepage,
      about: res.data.about,
      reviews: res.data.review,
    },
    revalidate: 1,
  };
};