Here is my podfile I use in the project:
source \'https://github.com/CocoaPods/Specs.git\' platform :ios, \'9.0\' use_frameworks! pod \'AFNetworking\', \'~&
Clean the pods cache in below paths and do pod install again.
~/Library/Caches/CocoaPods/
~/.cocoapods/repos/ibm-cocoapods-specs