Communication activity cannot have more than one Sender party

Hi,

I am moving emails from source CRM 2013 to Destination CRM 2015. For this i am having following two Scribe Workbench packages

1. I have moved all the email from Source CRM to Destination
2. Moving activityParties for emails from source to destination, but errors occurring for some records (Communication activity cannot have more than one Sender party)

Please let me know if some resolved this kind issue.

Thanks..