I've spent several hours today reading a sideloaded epub. It's a DE-DRMd epub of a book I bought from Kobo. I was last reading it on my Sage about 80 minutes ago. Because I was nearly finished it, I decided to open another book. Another sideloaded epub transferred via Calibre yesterday. I got the following message:
The same epub opens just fine on my Libra, no such error. Then I tried a few others of the books I loaded on to my Sage yesterday, all books that are on my Libra. ALL gave the same message. So I went to open the book I had been reading and, the same message appeared!
What is going on?!