The error (An Error occurred when attempting to create the shipment: Shipper County is required) from Samos is caused by the County missing from the Warehouse Contact Details. To fix this, please follow the steps below:
Click Warehouse then Manage Warehouses.
Then, click Edit against the Warehouse you want to dispatch the order against.
Ensure the County field is populated.
We recommend populating all Warehouse Contact Details to ensure compliance with other couriers.
Click Save.
Retry generating the shipment for the order.