I would appreciate any help for this error CS1061 on Unity 5.6.1f1. When I compile from Unity target device Windows Universal 8.1 I get a compile error.

Assets\Vuforia\Scripts\Internal\ComponentFactoryStarterBehaviour.cs(25,55): error CS1061: 'Type' does not contain a definition for 'GetMethods' and no extension method 'GetMethods' accepting a first argument of type 'Type' could be found (are you missing a using directive or an assembly reference?)

Not sure how to resolve this and I know it's a legacy build but my target device is Windows 8.1.

I am successful in a Win 10 UWP, Multi Target, Multi Sound, build and deploy but I am unable to setup my development environment for Windows 8.1. 

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void Awake()

        {

            List<MethodInfo> methods = this.GetType().GetMethods(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.DeclaredOnly).ToList();

            methods.AddRange(this.GetType().GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly));

            foreach (MethodInfo methodInfo in methods)

            {

                foreach (Attribute attribute in methodInfo.GetCustomAttributes(true))

                {

                    if (attribute is FactorySetter)

                    {

                        #if NETFX_CORE  

                        Action factorySetMethod = methodInfo.CreateDelegate(typeof(Action), this) as Action;

                        #else

                        Action factorySetMethod = Delegate.CreateDelegate(typeof(Action), this, methodInfo) as Action;

                        #endif // NETFX_CORE

                        if (factorySetMethod != null)

                        {

                            factorySetMethod();

                        }