error: unable to read module map contents from 'Target Support Files in iOS

Xcode might be using another projects project path, even though your project is a new project. Closing Xcode and deleting the xcode preferences from ~/Library/Preferences/ might fix the issue.

Check whether it is related to Pod files, if so try installing using pod install cmd via terminal. AFNetworking is related to PodFiles, just comment out your pod files and then run pod install in your terminal (it will remove the respective files). Now remove the comment in your pod file and run pod install again.

Sometimes this issue comes when you left library installation using cocoa pod without completion. Hitting command pod install worked for me.