unknown_token: It looks like your Jetpack connection is broken. Try disconnecting from WordPress.com then reconnecting.
This problem might happen when you restore your blog from backup. This is not a big problem. You just need to obtain new fresh token from Jetpack site. Easiest and fastest way to do it is to simply disconnect and connect again your site as error message suggests.
Steps below will show you how to do this.
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Go to Jetpack / My Jetpack
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Click Disconnect site from WordPress.com
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Confirm Disconnect
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Now that you have successfully disconnected your blog from WordPress.com, it is time to re-connect it by clicking Connect Jetpack
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Verify that you are connecting as a correct user by looking at the Connecting as: field. If everything is ok, click Approve button
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Done! You should get confirmation screen as shown below. Now Jetpack should work with no problem.
What about multisite setup