Can't update iPhoto and iMovie.  "ther was an error in the App Store (18)

I can't update iPhoto or iMovie.  All others update OK.  message pop up: "There was an error in the App Store" (18)

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 try updating your apps.

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