Hi Team,
when we are publishing the article on our newly migrated AEM 6.3 instance. we see the publisher replication agent queue is getting flooded with same article again and again. for all locales. follwoing is the queue image.

and we see the following eror in the error.log file. please find the attached file livecopy_error.log in the following link. Thank you.
livecopy_error.log - Google Drive