• No routes selected / No stops selected — the cancel or delete request arrived without any route/stop ticked; select at least one and retry.
• Invalid Stop Id — the Edit Stop form was submitted without a stop reference (for example after the page was left open too long); reopen the row's Edit button.
• Error in Stop Id — the stop no longer exists in Sprwt (it was already deleted or its route cancelled); reload the page.

All of these are shown as a red alert at the top of the Deliveries page.