Oops! This document couldn't be opened.

I hope that this will be helpful to other Kobo users. I signed out of my account on my Kobo recently, and after I signed in again, I could no longer open books. Every time I tried, I received the error message: Oops! This document couldn't be opened. I tried syncing my Kobo with my account, doing a Repair of my account, signing out and in again, and doing a factory reset of my device, each multiple times, but the problem persisted. 

Finally, the following worked: I signed out again, but when I signed back in, instead of using the option to sign into my account on my device with my email and password, I used the six-digit code displayed on my device to sign in from the Kobo website on my computer, which did the trick. 

UK (and perhaps other countries?) instructions to make your kobo work with Overdrive library books

I have a Kindle where I borrow books from my US library, but in the UK it does not work. Not wanting to jailbreak it, I bought a Kobo and hit the wall with repeated error messages preventing download.

If you get error messages such as

E_AUTH_NOT_READY

Or

This title has been downloaded using a different account. Authorize this app with the same OverDrive account (or Adobe ID) you originally used to download the title.

Or

E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER

I hope this can help you.

Today I gave a good go at piecing together the information that is around from several sources (thank you all that worked so hard to get the various bits – I needed several of your suggestions)

I hope this compendium helps in resolving this issue:

1. Unauthorise your computer (Ctrl+Shift+D) in Adobe Editions
2. Uninstall any adobe digital edition version you may have (if it’s not 3.0)
3. Download ADE 3.0 from the following URL

http://www.adobe.com/support/digitaleditions/downloads.html

Note: IT MUST BE 3.0

1. Install ADE 3.0 on your computer.
2. Make sure you delete any junk prior authorisations lurking in the depths of the computer as follows (Mac and Windows)
3. Open Adobe Digital Editions.
4. /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.

Mac OS

Note:

If you are unable to find the activation.dat file in Mac OS X 10.7 or later versions, see Can't see user library files in Mac OS X 10.7 and later.

1. Click OK and quit Adobe Digital Editions.

Windows XP, Vista, 7, 8.1, and 10 versions

Troubleshooting reauthorization and deauthorization issues on Windows

Note:

The following task requires you to modify the Windows registry. The registry contains system-related information critical to your computer and applications. Before you modify the registry, create a backup copy. Adobe does not provide support for problems that arise from improper modification of the registry.

For more information about the Windows registry or the Registry Editor, see the Microsoft Support site.

If the deauthorizing process is unsuccessful on Windows, it is possible to modify the registry to remove the activation information.

1. Close all applications.
2. Choose Start > Run.
3. In the Open text box, type regedit, and then press Enter. The Registry Editor opens.
4. In the left pane of the Registry Editor, locate the registry key, HKEY_CURRENT_USER\Software\Adobe\Adept
5. Go to the Device folder
6. Select the Adept key.
7. Choose File > Export.
8. In the Export Registry File dialog box, select Selected Branch under Export Range. Enter a name and location for the backup registry key. Click Save.
9. Right-click the Adept key and choose Delete.
10. In the Confirm Key Delete dialog, click OK.
11. Close the Registry Editor.
12. Open Adobe Digital Editions and reauthorize.

Now that you have got rid of those pesky files

Go in Overdrive to your library

Borrow a book and open overdrive in a browser (I did- I do not know if it makes a difference but just in case)

Choose download

When you click on the downloaded link (the .acsm file) it will ask you to authorise the device
Make sure you authorise with your overdrive credentials. I also noticed that in the drop down menu there are TWO overdrive links (actually several are duplicated). Why??? I used the first one if it makes any difference.

Connect the KOBO reader

Now you can transfer and read your borrowed library  books

It worked for me but it defies belief that this issue is around since 2014 and not sorted yet?!??

Happy reading and thanks again to all that provided input and parts of this text

The newest Kobo update fixed the problem. Surprise...

It looks as if this is an ongoing issue that Adobe need to resolve.  I had the issue with my old Kobo, which died.  I was very happy with my new Kobo when I could copy files without any problem.  After a month or so, the same problem developed on my new Kobo.  In my case, it frequently works if I just reconnect the device, delete the book from the Kobo (still keeping it in ADE) and just re-copy it to the device.  Copying the first time never works, copying the second time frequently.  The third option is to delete all files from the ADE and the computer and re-download the file.  This applies for books from the library, not for purchased books.

I was having the same problem, but only with my laptop, not moving books from my netbook to my Kobo.  I finally solved the problem and after trying many things, I discovered it was a simple fix.  My netbook has Digital Editions 3, which works great.  My laptop has 4.5, which gives me the OOPs message.  I tried uninstalling version 4.5 and installing version 3, but got a different message.  It finally hit me that I was missing a step.  First thing I did was deauthorize my laptop.  Then I uninstalled version 4.5 and installed version 3.  I opened up Adobe Digital Editions and authorized my laptop.   I removed all the books from the Library.  I closed ADEditions and reopened it (no books), moved the books back in from my downloads file into Adobe Digital Editions and then onto my Kobo.  Voila!  It worked.  I hope this works for you.

I am having the same problem and am unable to resolve. I have re-installed ADE, re-authorized my device, re-borrowed my library book and no success having had no problems within the last three months. Adobe doesn't offer support because ADE is a free product. Kobo identified the problem to Adobe. I'm hoping Overdrive can help me but that hasn't proved helpful either. Very frustrating!

I have an old 7 inch tablet i prefer the Kobo but as that is garbage for my needs, until this is resolved. I found i can install overdrive and digital editions to my tablet and add my library and FINALLY read my books.

I talked to Kobo just now they seem to realize the problem is with Kobo, They told me they were aware of the problem and were working on it. Since Kobo and overdrive are the same company it should be easy to fix.  Who knows... I will let the forum know if i get any information that helps. but to speed up the process you might want to give Kobo a call...Please give us a call at 1 (800) 368-5390 from 9 AM to 9 PM, 7 days a week. If they get enough of us calling they may actually try to fix the problem... ADE please leave this response intact as you clearly have no interest in the resolution.. 

I am so frustrated. NOTHING works. Adobe is silent and nothing in the forum has worked. Deleting everything and a factory reset on the Kobo still Oops! Kobo said it is an Adobe problem, or a library issue. The 2 librarys I called have never heard of this problem. I looked at overdrive since they are now owned by Kobo and there is no mention of this error.

I share your frustration.  For two years my Kobo Touch worked perfectly with the public library.  Suddenly, it quit!  I am sick and tired of the days, not just hours, that I have spent on deletions, installations, authorizations, different versions of ADE and still nothing has changed.  I can read library books in ADE but not on my e reader!  Seems like perhaps we might have to leave Kobo for a different brand of e reader.