Error: Missing SITE_URL in env file

[Serbia580]

Error: Missing SITE_URL in env file

03:26:35.377 | at generateRssFeed (/vercel/path0/.next/server/app/blog/page.js:502:15)
03:26:35.377 | at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
03:26:35.377 | at async getData (/vercel/path0/.next/server/app/blog/page.js:542:5)
03:26:35.377 | at async Blog (/vercel/path0/.next/server/app/blog/page.js:560:29)
03:26:35.403 |  
03:26:35.403 | Error occurred prerendering page "/blog". Read more: https://nextjs.org/docs/messages/prerender-error
03:26:35.403 | Error: Missing SITE_URL in env file
03:26:35.403 | at generateRssFeed (/vercel/path0/.next/server/app/blog/page.js:502:15)
03:26:35.403 | at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
03:26:35.403 | at async getData (/vercel/path0/.next/server/app/blog/page.js:542:5)
03:26:35.403 | at async Blog (/vercel/path0/.next/server/app/blog/page.js:560:29)

[fhnasgf28]

help me please

how to fix this error, first running

if (!parsedPageId) {

240 | throw new Error(invalid notion pageId "${pageId}")
| ^
241 | }
242 |
243 | const body = {