Facebook SDK missing AndroidManifest.xml and I can't generate it

I can't understand why there must be so many problems with any plugin I am trying to implement. I am talking about Facebook SDK or Google Play Services; not sh*t... Shouldn't packages just work? I am curious to know. I am not just complaining.

Anyway, I am trying to implement Facebook SDK. Everything is fine in Unity. When I try to build it for Android I get this error several times:

 An android manifest must be generated for the Facebook SDK to work.  Go to Facebook->Edit Settings and press "Regenerate Android Manifest"
 UnityEditor.HostView:OnGUI()
 
 FileNotFoundException: /Applications/Unity/Unity.app/Contents/PlaybackEngines/AndroidPlayer/Apk/AndroidManifest.xml does not exist
 // and other stuff...

So I go to my Facebook->Edit Settings and when I press on "Regenerate Android Manifest" I don't think it does something. If I press "Build SDK package" I get this error:

I also have error which are concerned about the GUILayout of some labels.... Don't know if it does matter...

 Style.Draw may not be called with GUIContent that is null.
 UnityEditor.EditorGUILayout:LabelField(GUIContent, GUILayoutOption[])
 Facebook.Unity.Editor.FacebookSettingsEditor:AppIdGUI() (at Assets/Facebook/Editor/FacebookSettingsEditor.cs:84)
 Facebook.Unity.Editor.FacebookSettingsEditor:OnInspectorGUI() (at Assets/Facebook/Editor/FacebookSettingsEditor.cs:59)
 UnityEditor.DockArea:OnGUI()