The data loader is logging the following error:
ERROR DataLoader FL.3: Exception has been caught - moving file <Data Loader Path>\80a84e8f-3cd2-caec-1f22-3b7fe466d401.xml to error folder.
System.Data.SqlClient.SqlException (0x80131904): The DELETE statement conflicted with the REFERENCE constraint "FK_MessageJournalReportAddress_MessageJournalReportID". The conflict occurred in database "AfterMail", table "dbo.MessageJournalReportAddress", column 'MessageJournalReportID'.
The DELETE statement conflicted with the REFERENCE constraint "FK_MessageJournalReport_Message". The conflict occurred in database "AfterMail", table "dbo.MessageJournalReport", column 'MessageID'.
The statement has been terminated.
Issue have been resolved in version 4.8
