Error in user YAML: (<unknown>): found character that cannot start any token while scanning for the next token at line 5 column 16

---
title: Add address validation in Checkout
issue: NEXT-9581
author: Max Stegmeyer
author_email: m.stegmeyer@shopware.com
author_github: @m.stegmeyer
---

Core

Changed AddressValidator to check for disabled countries and validation issues of both billing and shipping addresses.
Added loading of countries of the Sales Channel to SalesChannelContext