Xcode 9 : I am facing this can you please help

[Rehmanbu]

Undefined symbols for architecture arm64:
"_CMSampleBufferGetImageBuffer", referenced from:
-[CLFaceDetectionImagePickerViewController captureOutput:didOutputSampleBuffer:fromConnection:] in CLFaceDetectionImagePickerViewController.o
"_CMCopyDictionaryOfAttachments", referenced from:
-[CLFaceDetectionImagePickerViewController captureOutput:didOutputSampleBuffer:fromConnection:] in CLFaceDetectionImagePickerViewController.o
"_CMSampleBufferGetFormatDescription", referenced from:
-[CLFaceDetectionImagePickerViewController captureOutput:didOutputSampleBuffer:fromConnection:] in CLFaceDetectionImagePickerViewController.o
"_CMVideoFormatDescriptionGetCleanAperture", referenced from:
-[CLFaceDetectionImagePickerViewController captureOutput:didOutputSampleBuffer:fromConnection:] in CLFaceDetectionImagePickerViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation

[Rehmanbu]

You need to add the CoreMedia.framework. Go to your target -> Build Phases -> Link Binary With Libraries and add it

thanks