The file: ReleaseNotes.html is looking for icons and images in a directory called releaseNotesData, which doesn’t exist.
The items it’s looking for don’t seem to be in the images directory either, however I did find them in the images directory of an older SDK release.
I fixed it by linking:
releaseNotesData -> old/images/
where I had moved the old release into the directory “old”.
Hope that’s clear.