Both messages are ownership checks. Uploads run against the kitchen currently selected in the admin: every location_id must be a retail-flagged location of that kitchen, and every meal_id must be a meal that belongs to that kitchen. Typical causes are copying IDs from another kitchen's template, using a wholesale or pickup location ID (only retail locations accept uploads), or a typo. Download the template from the target location's own Retail Menu page - it already contains the right location and meal IDs - and only fill the quantity column.