Hi, some guessing here so don't be too hopeful.
First a question: does the Kobo show up in ADE but not authorized, or does it not show up at all?
This may work if the Kobe shows up but not authorized.
Most ereaders get authorized from ADE rather than on the eReader.
It may have somehow got partly authorized. Try the following:
- With the Kobo plugged in, run ADE.
- Hit ctrl-shift-E (cmd-shift-E on the Mac) and follow the instructions to completely deauthorize the Kobo.
- Stop and restart ADE.
- With luck, it will come up with a box asking you to authorize the Kobe device.
- Choose 'yes' or whatever the option is.
If the Kobe shows up but not authorized and the above does not work, try this slightly more violent (software only!) approach.
In order to fix this error message please follow the steps as suggested below.
I've copied this from http://www.mobileread.com/forums/showthread.php?t=206559 , but I've seen it suggested elsewhere too.
1) Open Digital Editions.
2) Connect the Reader and open it.
3) Press the keys Ctrl + Shift + E on your keyboard.
4) Now unplug the Reader and replug it.
5) There you will find a new drive created similar to C or D drive under "My computer".
6) Open the Readers Drive and you will find one or two folders with name adobe.digital.edition.
7) Delete thyis folder and plug off and re plug in the Reader.
8) Authorize Reader from the same Adobe ID which you used to Authorize Adobe Digital Editions.