The offending template is in one of two places:
1) preferences -> Sending books to device. Halfway down the page there is a box labeled "Save template".
2) preferences -> plugins -> device plugins -> kindle file then click "customize". There will be a template box a bit down the page.
One or both of the templates will contain "authors" twice, or will contain both "authors" and "author_sort".
You can probably make the error go away by checking preferences -> adding books -> read metadata from file contents instead of file name. The downside of this change is that importing books will be slower.
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