Use of undeclared identifier: ASIdentifierManager
Have you imported headers from the framework?
#import <AdSupport/ASIdentifierManager.h>
Thanks for your answer! if it is a framework add the beginning path. The example that repaired my error was:
#import "CoreMotion/CMMotionActivityManager.h"
I was incorrect as I only added the .h file.
#import "CMMotionActivityManger.h" --- This was incorrect and generated an error.