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An unknown error has occurred app store

An unknown error has occurred


This message An unknown error has occurred when i try login to APPSTORE in my MacBookAir.'

MacBook Air, OS X Mountain Lion (10.8.1), Problem to log in to app store

Posted on Aug 31, 2012 3:45 AM

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198 replies

May 9, 2017 7:12 AM in response to mycarehealth

HELPFUL, Idk why I can't rate it anymore but this worked for me.


I got a handed down Macbook Pro from my older brother, and it kept bugging me why I can't update OS X to MacOS. It kept on asking me to sign in, but it just kept on giving me errors like "Unknown Error (4)" or something. Turns out my brother's account was still signed in to appstore and I kept on logging in mine. so there, signed him out and logged on to mine. Done! THANK YOU SO MUCH!!!

An unknown error has occurred app store

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