Conflict Resolution
I have removed all the collections and emptied my library as well. So, when I sync with server, I get the following message.
https://www.dropbox.com/s/9wub5ife5fdv7ls/Syncing%20error.png
https://www.dropbox.com/s/9wub5ife5fdv7ls/Syncing%20error.png
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Upgrade Storage
(This is likely happening because you performed those deletions before successfully syncing with the server)