Hello Mara,
we looked deeply at your problem and actually found there is some strange behavior in Adobe Digital Editions itself.
In fact, if you try to open the epub instead of importing it to your library, it works flawlessly: right-click your epub file and choose
Open with... > Adobe Digital Editions
and it will open.
When you click "Library" it will ask you to import the file to the library, doing this will produce an error but ADE will import the file anyway.
As I just said, this seems more to be an ADE problem than ours, but anyway we will investigate further and try to fix this.
Best Regards,
Angelo
