As a workaround I did this:

  if (slug === "sw.js") {
    return { props: {} }; // Return empty props or handle as needed
  }

https://nextjs-forum.com/post/1172862208242372620
same problem

Hi @Ray hope you're doing well.

Do you have the same problem? Seems like this is a common issue..

nope

have you tried other browser?

or try start the server with different port
PORT=4000 npm run dev

probably you have server worker registered with other app with same url. check your dev tool

I've tried also other browser, same issue:

I've tried Firefox + Chrome.

with npm run build && npm run start

have you checked here?

hmm, with port:4000 seems to not happen anymore.

look like this is the reason

This service worker helps the browser to serve the page faster and cache the content?

unregister it

only if you have implemented service worker for your app

like pwa

or you can just ignore the error

aa, yea, I've installed pwa on other app, probably that's why I found that sw.js.

Thank you very much :). Now I know what to do.

np