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I can't tell you where this error comes from, but i also got it when setting up syncing with Dropbox lately.

As was mentioned in this question Dropbox has a problem with symbolic links.

So I have come to a working solution for me by just symlinking the actual folder of my notebook files, which is /home/myname/.sage/sage_notebook.sagenb/home/admin in my case to a Dropbox folder

ln -s /home/myname/Dropbox/sage/admin/ /home/myname/.sage/sage_notebook.sagenb/home/admin

this done also on my laptop works very good for me. Don't forget to put the files from admin, which is also symlink in first place, into your Dropbox folder.

I have no idea about symlinks in mac os and I can't garantee for anything though.. Greetings, marv