Hi,

This issue usually happens when the default warehouse locations (like Stock, Input, and Output) are missing, renamed, or deleted. To fix it, you should verify under Inventory → Configuration → Locations that internal locations such as WH/Stock, WH/Input, and WH/Output exist. If not, they should be recreated manually. Additionally, you can check under Inventory → Configuration → Operations Types to ensure that each picking type linked to your warehouse has valid source and destination locations.

If the error persists in a new database, you can delete the failed warehouse record, activate developer mode, and confirm there are no broken default warehouse references in the system parameters. As a final option, you can recreate the warehouse and its default picking types programmatically using the Odoo shell, ensuring all required locations are set up correctly. In short, the problem occurs because Odoo cannot find or assign a destination location to one of the picking types created automatically during warehouse setup.

Hope it helps