Error message while exporting or preview

Hi There I am reposting this plea for help as I am yet to resolve it and it has wasted hours of my time.

I am on RW7.5 using the following

Feather Theme
Photo Base/Photo Group
Gallery 3

After loading numerous images (53 - 90) into either of the 2 gallery plug ins listed above. I am getting an error message titled EXCEPTION WHIE EXPORTING SITE

The jpg file ref in the error message does not correspond to any files of mine. Also, oddly even if I delete image or the gallery from the page and preview, I get the same message even though there are no images on the page.

Is this a RW Bug or Feather Theme bug??? I have sent this to RW support but have yet to receive a response. This is stopping me from finishing a site.