clang: error: linker command failed with exit code 1 (use -v to see invocation)

Anyone know what this means or how I see the invocations? I think it may be related to the facebook sdk

31 May 2016 ... Nj5dRV/Frameworks/FacebookSDK/Plugins/iOS/FBSDKLoginKit.framework/ FBSDKLoginKit(FBSDKLoginCompletion.o) for architecture arm64

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