Open up a tech support case by going to http://www.adobe.com/support/digitaleditions and clicking on 'Submit a web case'
Make sure to include the details in your case including the AdobeID you are using as well as the complete error message as you did here, and it will help speed things up.
Having spent several hours talking with semiEnglish-speaking reps and sending 7 emails, I was just told Adobe doesn't support this product any longer. I am so angry that this company will never ever supply me with free spit. My fervent wish is that they go bankrupt tomorrow.
Adobe Digital Editions (like other free Adobe products) is not supported through email or phone. To get support you must submit a web case (link above).
If ADE is not supported by email or phone then you're basically implying there is no way to get support.
Clicking on the web case link at http://www.adobe.com/support/digitaleditions/ presents the user with two options:
1) Option to take you back to http://www.adobe.com/support/
2) Paid support at $39.99 a month.
Why can't you just make it clear there is no support. That way people don't waste their time submitting help requests on the forum for ADE.
My problem with ADE was the up and down keys stopped working, allowing me no way to navigate a pdf by keyboard. Users have been logging this issue since 2008 and it's never been solved.
Shows there are elements within Adobe that don't care about the customer experience.
Once you get to the web support portal (going through www.adobe.com/support/digitaleditions and clicking on 'Submit a web case' is just the best way to explain how to do it), you have the change to submit a Tehcnical Support (web) case.