Program error message while using Photoshop Elements 15 on Windows 10

I have elements 15 on a pc with Windows 10. It has worked just fine until today. After I have taken a raw image to the raw editor, done some editing, then opened the image in the non-raw editor, and done some further editing, when I try to save the image to a jpeg or any other choice, I get a message that says "could not generate a preview because of a program error".  This has never happened before and I never had prior problems editing and saving images as I describe doing above to the elements catolog.

Thanks very much for any help

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