I followed the below directions from another post and then reinstalled the twentyfourteen theme – deleted the twentyfourteen-old theme.
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1. Using FTP or whatever file management tools your host has provided you with navigate to the wp-content/themes directory.
2. Once there locate and rename the twentyfourteen directory to twentyfourteen-old. Just that one directory and nothing else.
3. Try and re-login to your WordPress dashboard.
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