Every time I try to update or buy an app from the app store it says there is an unknown error

So everytime I try to update an app or buy an app from the app store it says unknown error (4). I don't know why it does this but it's really annoying and it has been like this for a while now. Itunes works perfectly for me. It's just the app store.

Try deleting the cache associated with the App Store.
Quit the App Store if it's open.
Open a Finder window. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Caches/com.apple.appstore/Cache.db
Click Go then move the Cache.db file to the Trash.
Relaunch the App Store and see if you can update or purchase an app.

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