This would normally mean you've run out of space in your Dropbox account. Please free up some space in your Dropbox account and try syncing again.
Article ID: 748
Created On: Mon, Sep 25, 2017 at 10:05 AM
Last Updated On: Mon, Sep 25, 2017 at 10:05 AM
Online URL: https://www.2doapp.com/kb/article/dropbox-is-showing-me-a-509-error-during-sync.html