Fix Magento 2.4.3-p1 critial errors

Job ID: 31948866

Budget: $30 – $50 USD

need help fixing some critical errors in Magento 2. see error log

main.CRITICAL: Type Error occurred when creating object: Magento\InventorySourceSelection\Model\Address, Argument 1 passed to Magento\InventorySourceSelection\Model\Address::__construct() must be of the type string, null given, called in vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php on line 121

main.CRITICAL: The contents from the pub/static/adminhtml/Magento/backend/en_GB/mage/requirejs/mixins.min.js" file can't be read.

main.ERROR: No such entity with customerId = [] []

main.CRITICAL: Error: Call to undefined method Magento\Catalog\Model\ResourceModel\Product\Flat::getLinkField() in vendor/magento/module-eav/Model/Entity/Collection/AbstractCollection.php:1066
Related categories: PHP JavaScript Magento eCommerce MySQL