I am getting a Apple Mach-O Linker Error everytime I import a file from CocoaPods.
Undefined symbols for architecture arm64: \"_OBJC_CLASS_$_FBSession\", r
This issue occurred for me after installing a pod via Podfile and pod install. After trying a bunch of different fixes I finally just imported the Pod manually (dragging the necessary files into my project) and that solved the problem.
pod install