This Synchronization is using a blocking download ack but has nonblocking download ack events defined

Error code –10284
Error constant NONBLOCKING_EVENTS_FOR_BLOCKING_ACK
Probable cause

The events nonblocking_download_ack and publication_nonblocking_download_ack may not be defined for a synchronization which is using a blocking download ack. Please check your -nba flag setting or remove the events.