Unexpected sign-in failure:  (attempt to index a nil value).

While trying to link LR and LR mobile, I'm consistently (several trys over a few hours) getting a message: "Lightroom has experienced an unexpected Sign-in failure. Please try again later. (attempt to index a nil value).
I've verified the Adobe ID and password -- what else should I try?

Try http://helpx.adobe.com/lightroom/kb/error-unexpected-sign-failure-occurs.html

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