The Blizzard Update Agent could not read a necessary file in order to run or update the game. This happens when a necessary file is corrupted or locked down by another program.
Tried everything here?
If you have tried all of the steps for your operating system and still require assistance, please visit our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) (Heroes of the Storm) or contact us.
Article ID: 6507