Why do I keep receiving Synchronization Log errors saying that some deletions failed in Outlook 2013?

14:14:14 Synchronizer Version 15.0.4420

14:14:14 Synchronizing Mailbox 'Roberts, Mandy M'

14:14:14 Synchronizing local changes in folder 'Drafts'

14:14:14 Uploading to server 'CH1PRD0102.mailbox.outlook.com'

14:14:14 Synchronization of some deletions failed.

14:14:14                                [80040119-20010C01-800408C4-130]

14:14:14                                Outlook Data File

14:14:14                                For more information on this failure, click the URL below:

14:14:14                                http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=80040119-20010c01-800408c4-130

14:14:14                  1 item(s) deleted in online folder

14:14:14 Done