Why do I get the message "This app is no longer shared with you."

This message is related to a Family Share setting which allows up to six family members to share each other’s iTunes, iBooks, and App Store purchases without having to share an account.You can learn more about this feature here:

    www.apple.com/icloud/family-sharing/ 

Family Sharing is set up on your device under the Settings app > iCloud.  You can learn more about setting up Family Sharing here:

    http://support.apple.com/en-us/HT201088