"unknown error has occurred" while trying to update apps

Hi all, hoping someone can help:
When trying to update apps in the App store, after being prompted to log into the app store, I get the error message "An unknown error has occurred" in red. I've tried restarting (the app and my mac) clearing the cache, and my firewall is not on. I am able to sign in to the the Itunes store, but cannot sign in at all to the App store. Any insights? Thanks!

Make sure you are signed out of iTunes before signing in to the Mac App Store.
And try deleting App Store pref file..
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Preferences/com.apple.appstore.plist
Click Go then move the com.apple.appstore.plist file to the Trash.
Restart your Mac and try the App Store.

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