Your Android setup is not correct. See Settings in Facebook menu.
UnityEngine.Debug:LogError(Object)
Facebook.Unity.Editor.XCodePostProcess:OnPostProcessBuild(BuildTarget, String)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
I am getting that error but I don’t know how to fix it. I’ve searched everywhere but their problems does not relate to this error.
Did you resolve this problem? I’ve tried downgrading the Android tools folder, but that didn’t work. I have the latest Unity version and the latest Facebook Unity SDK.
Same problem, using Unity 2018.1.5.f1 on windows 10 pc. Error message is completely useless, if you’re going to thow an error that prevents building then at least show the cause of the problem.
How does your Facebook settings look like?
Do you find how to resolve this problem? I have got this issue 
Do anyone got the solution?? Same problem here