i have this inside app/sitemap.ts

import { getData } from "@/lib/meta";
import { Blog } from "@/utils";

export default async function sitemap() {
  const posts = await getData();
  const baseUrl = "https://enigma.fm";

  const postUrls = posts.map((post: Blog) => ({
    url: `${baseUrl}/community/blogs/${post.slug.current}`,
    lastModified: new Date(post.publishedAt),
  }));
  const uniqueAuthors = new Set(
    posts.map((post: Blog) => post.author.slug.current)
  );

  const authorUrls = Array.from(uniqueAuthors).map((authorSlug) => ({
    url: `${baseUrl}/community/author/${authorSlug}`,
    lastModified: new Date(),
  }));

  return [
    {
      url: baseUrl,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/pricing`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/profile`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/signup`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/signin`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/success`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/privacy`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/refund`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/terms`,
      lastModified: new Date(),
    },
    {
      url: `${baseUrl}/community`,
      lastModified: new Date(),
    },
    ...postUrls,
    ...authorUrls,
  ];
}

i was trying to dynamically generate sitemaps with the help of the docs from next js, so the sitemaps are perfectly fine on development but it gives this error while i try to deploy it to the vercel