Problem opening an ebook (with correct Adobe DRM authorization)

Hi,

I´m having issues opening an ebook in my ereader. I have downloaded the ebook from a library. I opened it in Adobe Digital Editions, which had already authorization with my Adobe account (Adobe ID). I also checked that the ebook had the same authorization, and it was correct. Then I moved it to my reader (which also had already with the same Adobe account). And checked that I could read it at the computer using ADE, and I could. Then I disconnected my ereader from the computer and tryed to open the ebook in the reader. But I got a problem saying that I had to check my Adobe DRM account.

I don´t understand anything. I attach some screenshots.

Thank you in advance for your help!