I am implementing FB Login so i Downloaded the SDK from https://developers.facebook.com/docs/ios.
then i drag n down FBSDKCoreKit, FBSDKLoginKit a
I had a similar issue, and could not resolve the compiler error anyway.
I followed and performed the exact integration steps a few times, until I noticed that I have a copy of the FBSDKCoreKit.framework inside my project folder (happened probably by a mistake). In addition the Framework Search Paths already contains $(PROJECT_DIR) besides /Users/{username}/Documents/FacebookSDK.
So I've removed the copy of the FBSDKCoreKit.framework from the project's directory and now everything works fine.