Need some help. When building unity project in xcode I get this error in xcode - cannot initialize a parameter of type 'GKPhotoSize' with an lvalue of type 'int' in ISN_GameCenter.mm file. Anyone know why?

There are no errors when building for Unity but when trying to build in Xcode this error shows up. I'm using unity 5.6.4. Thank you kindly for any help.