Expiration date is required but missing for SKU \\"SKU NUMBER HERE\\" in box \\"{cartonId}\\" in message \\"1\\". (FBA_INBOUND_CARTON_015)
The error FBA_INBOUND_CARTON_015 (the expiration date error) relates to an item in your shipment not being provided a required expiration date. The MSKU causing the issue will appear between slashes.
Once you have provided the expiration date and resubmitted the shipment batch, the problem should go away.