is already being used by another user account on this computer. Either log in to that account and close, or check for more solutions at the link below.
Error: BLZBNTBTS0000000A, BLZBNTBTS0000000B, BLZBNTBNA00000009 is currently running on another user account on this computer. Only one instance of can run at a time. Follow the steps below to resolve the issue.

  1. Log in to the other user account, sign out, exit, and try again. 
  2. A corrupted cache folder can cause issues with Blizzard games. Try deleting the cache folder.
  3. If the issue persists, save any open files and restart your computer.

Tried everything here?

If you have tried these steps and still require assistance, visit our Technical Support Forum or contact us.