linker command failed with exit code 1 (use -v to see invocation) unity 5.5 to xcode 8

Hi, After a long way of trying to build my game from Unity to XCode, I keep getting the following error "linker command failed with exit code 1 (use -v to see invocation) ". The game works perfectly fine with Android and Fire TV but IOS keeps complaining. Can someone please guide me as to what the log suggest and thank you very much.