EPUB validation error – missing image file in Calibre

[Luxfort]

Hello,

I have an EPUB book that I am trying to validate, but I cannot resolve a validation error.

The validator reports a missing image resource:

media/file38.png

I have checked the EPUB in Calibre and tried searching the files, but I have not been able to locate the reference that causes this error.

The book contains an About the Author section with an author photograph. I have checked the image files, but I am still unsure where the incorrect reference is located.

Could someone please explain how I can find the reference to this missing image and correct the EPUB?

I am using Calibre on Windows.

Thank you for your help!