There's another community post with 404 debugging tips that might be helpful. Please give these solutions a try and let us know how it goes.

https://community.vercel.com/t/debugging-404-errors/437

Vercel Community

Debugging 404 Errors

Sometimes things don’t go as expected when deploying a website. If you see a 404 on your site, that means the page or resource couldn’t be found. There are...

A human should be around soon to offer more advice. But you can also get helpful information quickly by asking v0.

please tell me this is default for not found page

where can i find this community please guide us

Hey @kiranmoshimoshi-gmai , Do you have this next app deployed anywhere? Typically the default font would come from your browser. Helveitca is the typical sans serif font in browsers.

Here is my browser for example:

The browser default font seems like the most likely cause. It's also possible that there's a global style being applied in your project. We can't be sure of the exact cause without seeing it.

But you can customize the error pages with not-found.js and error.js files if you want full control over how the error pages look. I hope that helps!