404 Error
The page doesn't exist.
What is 404 Error?
A 404 error means the URL someone requested doesn't exist on your server. Either the page was deleted, the URL is wrong, or routing isn't set up correctly. One of the most common errors in vibe coded apps after deployment.
The fix is usually simple: check that the page file exists at the right path and that the URL matches your routing structure.
In Vibe Coding
After deploying a vibe coded app, 404 errors often happen because the routing doesn't match the URL structure. In Next.js, every page needs a matching file in the app directory. If /pricing returns 404, check that src/app/pricing/page.tsx exists.
Example
For example: You deploy your app and share the link yourapp.com/about. The user sees "404 Not Found." You check your project and realize you named the file About.tsx instead of putting it in src/app/about/page.tsx.