Fix Mac App Store An Unknown Error Occurred (100) Problem -
Most of us might have gone through this error that says ” We could not complete your App Store request. An unknown error occured(100). There was an error in the App Store please try again later“.This is really annoying isnt it ?
Now I m gonna tell you a clear and easy way to fix this issue .
* Firstly if you are logged in just logout & Just have to Quit the App Store.
* Now you need to Logoff and Restart Your Mac again.
* Then Log in to your App store Account.
* Atlast the job will be done and you can start downloading your Apps.
Note :As suggested by few people the following method must work too you just have to delete this folder(library>caches>com.apple.appstore) and make a quick restart.