Cannot deploy "Basic Auth Password Protection" example to Vercel

[judewang]

Problem

I copied and pasted the _middleware.ts from example repo to my Next project, everything worked fine on development environment, and I can run yarn build successfully. When trying to deploy to Vercel, I kept getting an error said An unexpected internal error occurred, then the deploy got failed. The error happened right after Uploading build outputs....

I found the official example will meet the error, too. We cannot even deploy the official example to Vercel.

How to re-produce the issue

Just click the Deploy button on the README page.

[juanantona]

I was having a similar issue a few hours ago and finally, I was able to deploy it. I guess that the issue was on the Vercel side.

[judewang]

It worked now, thanks.