Form not doing anything

I created a Filament page with a form on it. The form is rendering but all of the other functions are not working. When i try

->afterStateUpdated()

->afterStateUpdated()

on the fields nothing happens. Probably i must have forgotten something but i can't find it.
This is the page: https://gist.github.com/ThijmenKort/9f8eafb7a5253b09b71da7e45e9ebbf1

Gist

Items page. GitHub Gist: instantly share code, notes, and snippets.

Solution

$form->statePath(‘data’)