I also have this issue. Is there an older version of the MoPub SDK that is compatible with Fabric? If so, how can we access that? This is the version listed on Fabric, and the one we are using for our first ad implementation.
Edited to add additional information to help the development team debug:
I am using Xcode 8. My deployment target is iOS 9.0. Here is a screenshot with the error I specifically am receiving: