This notice appears when Sprwt cannot find a single delivery date that matches the selected kitchen. Almost always it means the kitchen has no weekdays enabled: open the link in the notice (it takes you to Settings > Kitchen Settings > Kitchen Locations > that kitchen) and switch on the weekdays under Meal Prep fulfilment (and Retail / Wholesale fulfilment if you use those). Save, then reload the dashboard.

If weekdays are enabled and you still see the message, the delivery-date calendar itself may have run out (dates are usually created years ahead) — contact Sprwt support to generate more dates.