Battle.net app problem updating wow

I’ve tried to update / patch my wow for the new add on . it keeps coming up with the same error oops looks like something has broke try restarting battle.net . This error only occurs when trying to patch wow , it won’t let me scan and repair the same message pops up . this is the first time i’ve ever gotten this message and i’m super confused over it

Well i have the same issue brother. i submitted a ticket to Blizzard and they talking something about cloud backup software. but i discovered an issue in the Event viewer on windows for my main disk for windows its a ''The IO operation at logical block address ‘’ error that happened for first time for me yesterday while i was doing the patch update. i do investigate this and ill try to reply again.

UPDATE: i moved the entire game(WoW retail) to another disk and works properly.
conclusion: in my case might be a disk issue that didnt let me update the game. im not sure yet. if someone with secure solution or what is this problem come from let us know.