UnityXcode ,Mach-O linker Error

When building my unity Xcode Project i get some errors. all of them are mach-O errors.
i have a my developers account linked. i have fixed some errors my self but i cant seem to fix this one. it does not seem to matter is my game center is on or off asfar as i can see.

can someone bestow me in their knowledge ?

see screen-cap below V

In Player Settings:

Change scripting backend to IL2CPP and change Architecture to ARM64

link for help:
http://docs.unity3d.com/Manual/iphone-64bit.html

I had the same problem.
I made a video to show you how to fix it.


As for the ObjC errors you need to add them as a flag in the build settings. Input them as -ObjC