_Problem with launching_

With the new iOS 8 update the game will not allow you to play because it says there is not enough memory for you to have any save data but meanwhile I still have 20GB left to be used, I have tried to uninstall and install the game about three times now and it still keeps coming out with the same message if u can fix this or give solutions on how to fix or somehow bypass this step Im open for any suggestions just want to get back to the fun I had before with the game Thankyou for reading

Pokethejoke about Gangstar Rio: City of Saints, v1.4.0