Quote:
Originally Posted by rachealwaceke
I have an epub file i am working on,it does not have any error(it is valid)
But when i want to open it using sigil and edit the alt text using the access-aide plugin it fails to open.Any clue on how to solve this. 
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Apparently, PIL couldn't detect the width and height of the cover image. What kind of image file are you using as a cover image?
(If the file type is not listed on
this page, the plugin won't be able to get its dimensions.)