Cannot generate article: It appears that your web server has some kind of timeou

I’m using oepnrouter by choosing free AI, but when I generate article, it always say:

It appears that your web server has some kind of timeout limit. This can also occur if you are using a VPS, CDN, proxy, firewall, or Cloudflare. To resolve this issue, please contact your hosting provider and request an increase in the timeout limit. Read more: https://docs.aipower.org/docs/content-writer/express-mode/faq#timeout-issue

how can i resolve this problem?