I've got that error message in one of my EPUB's too.
Only on mine, it won't even load the first page (the cover page) which is a .png file.
I've tried switching the cover page with another .png image, but it didn't work either.
I've also tried just removing the cover page. No dice, still can't view the EPUB.
I haven't found any info on this either, hopefully someone else has more experience with this?
I just got my PRS-950 not too long ago, so I'm still learning the ropes. Someone help please!
