Did you try to buildlocally? npm run build

should get the same error there

mmm.. yeah, same problem

I didn't do the course but they probably did some setting for the devenvironment to ignore Typescript error to make it easier on the beginners.

You can go two routes:
a): Ignore Typescript errors everywhere (build and dev, local and production). This is obviously not great but since you are learning, you may want to defer Typescript to a later point in time.
In your next.config.js

module.exports = {
  typescript: {
    // !! WARN !!
    // Dangerously allow production builds to successfully complete even if
    // your project has type errors.
    // !! WARN !!
    ignoreBuildErrors: true,
  },
}

I mean you see the warnings. Only for learning purposes not a real production app.

b) Setup something like eslint to get the errors in your IDE (vscode or whatever you use) and fix the Types
Screenshot of a Type Error in vscode:

//Edit
Alomost forgot. Your Error particular you most likely just forgot to import the Type "Metadata"
import { type Metadata } from "next"

// Edit2:
In general always first build locally (and fix errors) before pushing to Vercel (or whereever you host)

i'm also using vscode and getting the error in IDE linter.
i don't think it's a good idea ignore errors although I have done it...
The Metadata interface is already imported in app layout

you have the error in /dashboard/invoices/[id]/edit/page.tsx

yes, and in other pages too
but that's how the course teaches
import only in the app layout

Hm thats not true give me the link where the course says that maybe you misunderstod

btw, the metadata pages its fully working on dev script

i just cant build

yea cause type errors don't stop you in dev

would be annyoing if the dev server stops every time you didnt define type (yet)

I don't see in the course where it says you only have to import metadata type in the layouts

i think you misunderstood something

you can use metadata in the layout and every page below it will 'inherit' that meta data that is true

but if you define more metadata within a child (like you did) in /dashboard/invoices/[id]/edit/page.tsx you have to import the type there as well

mm, i assumed wrong

thank you for your help