This error occurs when the Blizzard Launcher cannot write files to your hard drive. This is usually caused by insufficient space on your hard drive, but may also be caused by hard drive errors. Select your operating system below, then follow the steps to resolve the issue.
Tried everything here?
If you have tried all of the steps for your operating system and still require assistance, please visit our Technical Support Forums (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) or contact us.
Article ID: 200466