This is a generic error, but the underlying issue is that interaction comments field in BBEC allows for more than 4000 characters and the interaction.long_comments field in TA it syncs to is only 4000 characters. When there are several interactions with this issue, this error would come up on those and all other interactions being synced. One workaround is to maintain comments values under 4000 characters.
If you receive this error, please create a support request at www.blackbaud.com/support
providing the details of the issue and referencing this solution.