Battle.net is currently running on another user account on this computer. Only one instance of Battle.net can run at a time. Follow the steps below to resolve the issue.
- Log in to the other user account, sign out, exit Battle.net, and try again.
- A corrupted cache folder can cause issues with Blizzard games. Try deleting the Battle.net cache folder.
- If the issue persists, save any open files and restart your computer.