Try unlinking the account while using "Private Browsing". Not sure if this will help or not, but it's worth a try.
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Still get the error :/
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I remember seeing this issue before. It happened for me when I tried to unlink an account while I was still logged into gmail elsewhere on my system. Unlinking the account while in private mode helped me, but I was using IE. If you're using chrome, it may keep you logged into gmail, even while you're private browsing. If you have a different browser, try using that in private mode.