The above unexpected errors occur when there is a critical, unresolvable issue with your game client. To troubleshoot it, follow the steps below.
Update Flash in Internet Explorer, even if you normally use a different browser.
If the problem persists, uninstall and reinstall the game.
If these steps do not resolve your issue, please make a post on our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) (Heroes of the Storm) and be prepared to provide your Blizzard App logs. Our developers will use these log files to identify where the operation failed and to improve the Blizzard Desktop Application.