Sync encounters an unknown error everytime I try to sync

Firefox Sync stopped working all of a sudden. It always says "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action." I've retried many many times. I even deactivated my Desktop account and then added it again in Sync. I keep getting the same error. I am running Firefox 4.0.1

I think I fixed this.
Go to [https://account.services.mozilla.com/ your sync account], log in, and click clear your sync data.
Then click the Sync now button on the error message.
The error went away for me.

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