This error is usually caused by an add-on for Firefox that interferes with your ability to sign into your library's OverDrive website. The add-on that usually causes this error is called "RefControl." Follow the steps below to troubleshoot your sign-in issue.

Here's the complete error message:

System Error
The following system error occurred...
Error number: 12
Reference ID: e43d3134-5170-439c-b3a1-97b4827bb263.
Error message: An error occurred processing the request.

How to fix it

  1. Try disabling "RefControl" by going to Menu > Add-Ons.
  2. From the Extensions tab, look for "RefControl," then click Disable.
    Restart Firefox if asked.
  3. Once "RefControl" is disabled, try signing in again.
    If this works, make sure "RefControl" is disabled whenever you want to sign into your library's OverDrive website.
  4. If you still can't sign in, disable all of your add-ons.
  5. Try signing in again.

If you had to disable all of your add-ons to sign in, try re-enabling them one at a time. Sign in each time you enable a new add-on until you find the one that's causing the issue. That way, you'll know which to disable when you want to visit your library's OverDrive website in the future.

Last Updated: Apr 19, 2016 10:14AM EDT