我已安装Facebook unity SDK 7.10.1并开始收到此错误：
"MissingMethodException: Method not found: 'UnityEditor.PlayerSettings.get_applicationIdentifier'.
Rethrow as TypeInitializationException: An exception was thrown by the type initializer for GooglePlayServices.PlayServicesResolver
System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor (RuntimeTypeHandle type) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.CompilerServices/RuntimeHelpers.cs:101)
UnityEditor.EditorAssemblies.ProcessEditorInitializeOnLoad (System.Type type) (at C:/buildslave/unity/build/Editor/Mono/EditorAssemblies.cs:130)"
我已卸载SDK 7.10.1并安装了SDK 7.9.4并仍然出现此错误。我使用的是Unity 5.5.3p4（64位）。