A long wall of errors that looks like the example below under List>Amazon Listing Errors:
(FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"2\". MSKU: \"1019349863\" (FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"3\". MSKU: \"1017921499\" (FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"3\". MSKU: \"1018711832\" (FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"3\". MSKU: \"1018824668\" (FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"3\". MSKU: \"1019271059\" (FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"3\". MSKU: \"1019342629\" (FBA_INBOUND_CARTON_026),MSKU not present in the shipment was entered for box \"{cartonId}\" in message \"3\". MSKU: \"1019344863\"
Typically this error occurs if there is a missing expiration date error as well (Carton_015). Once the expiration date error has been corrected the remaining errors should be resolved.
This can also occur if the feeds are submitted before the batch is completed (multiple tabs). Resending the feeds once the batch is finished resolved the error.