I was using the app and wanted to vote to close. I was unable to do so, choosing vote immediately popped up a modal box saying that there was no reason.
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This will be a little better in 220.127.116.11.
This error message appeared because either the question was closed or you already voted to close it, so I'm updating the error message to say just that:
No options found
Could not find any close options for this question. You may have already voted to close this question or it may have been closed by other users.
It would be nice to be able to cancel or change your close vote from the app, but that's a topic for another feature-request.