Fix iOS 8 Family Sharing not working on iPad/iPhone

Without using the same account, the Family Sharing feature in iOS 8 offers the new way to let up to six users in your family to share and use each other’s purchases things from App Store, iTunes, and iBooks with the same credit card. However, i have setted up it on my iPad running IOS 8 and My wife attempt to download and install “My Media Center” app purchased by Family Sharing Originator account from “Ceton” on my iPhone, it shows the error message “Redownload Unavailable with This Apple ID. This redownload is not available for this Apple ID either because it was bought by a different user or the item was refunded or cancelled.” with OK button. Then I still can’t get the free app from this particular sense, even tried a different paid app. How can I fix the family sharing not working issues?
Many people have reported that their family sharing is not working on iPhone, iPad devices with the error “redownload unavailable with this apple ID”. If you also get the same problem, you could try the a simple solution below and I understand that logging out of the account in the App Store and then logging back in will get rid of this annoying prompt.
* First turn all of the iOS devices ON and OFF. Then on the iOS device which has the problem, tap the App Store icon to launch it.
* Select the “Featured” tab, scroll to the bottom to tap on your Apple ID, and select “Sign Out.” button.
* Tap on “Sign In”, input your Apple ID name and password to log in system.