[Android] No constructor found - Xamarin Forms 1.5.0.6446 [Need Urgent help]

Hello Everyone,

(writing this text a second time, since the Forum Save Draft does not work )

I have a project a have been working on a few months and for some silly reason I updated the Xamarin Forms packages before the final deployment, and now I have some issues. I do not remember changing anything in the code. This issue appeared 1 day apart.

I am using a Shared Project, with iOS and Android. After the update of the packages, the iOS works fine, but the Android crashes. Here is the error :

Java.Lang.RuntimeException: java.lang.reflect.InvocationTargetException
  at --- End of managed exception stack trace ---
  at java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
  at at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
  at at dalvik.system.NativeStart.main(Native Method)
  at Caused by: java.lang.reflect.InvocationTargetException
  at at java.lang.reflect.Method.invokeNative(Native Method)
  at at java.lang.reflect.Method.invoke(Method.java:515)
  at at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
  at ... 2 more
  at Caused by: md52ce486a14f4bcd95899665e9d932190b.JavaProxyThrowable: System.MissingMethodException: No constructor found for FormsPortable.ALCBasePage::.ctor(FormsPortable.RootPage)
  at System.Activator.CreateInstance (System.Type,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo,object[]) [0x000fd] in /Users/builder/data/lanes/2058/58099c53/source/mono/mcs/class/corlib/System/Activator.cs:270
  at System.Activator.CreateInstance (System.Type,object[],object[]) [0x00000] in /Users/builder/data/lanes/2058/58099c53/source/mono/mcs/class/corlib/System/Activator.cs:224
  at System.Activator.CreateInstance (System.Type,object[]) [0x00000] in /Users/builder/data/lanes/2058/58099c53/source/mono/mcs/class/corlib/System/Activator.cs:219
  at FormsPortable.RootPage..ctor () [0x00071] in /Users/path/FormsPortable/RootPage.cs:36
  at FormsPortable.RootPage.getInstance () [0x00016] in /Users/path/FormsPortable/RootPage.cs:17
  at FormsPortable.App.GetMainPage () [0x00001] in /Users/path/FormsPortable/App.cs:22
  at FormsPortable.App..ctor () [0x00008] in /Users/path/FormsPortable/App.cs:16
  at FormsPortable.Android.MainActivity.OnCreate (Android.OS.Bundle) [0x0001b] in /Users/path/FormsPortable/Android/MainActivity.cs:46
  at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (intptr,intptr,intptr) [0x00011] in /Users/builder/data/lanes/2058/58099c53/source/monodroid/src/Mono.Android/platforms/android-21/src/generated/Android.App.Activity.cs:2707
  at at (wrapper dynamic-method) object.b2c0b6b6-10c0-4cb7-836c-6835a64ef178 (intptr,intptr,intptr) <IL 0x00017, 0x00043>
  at at md582bcd42a84ef341846534077897dfd3b.MainActivity.n_onCreate(Native Method)
  at at md582bcd42a84ef341846534077897dfd3b.MainActivity.onCreate(MainActivity.java:28)
  at at android.app.Activity.performCreate(Activity.java:5451)
  at at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
  at at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
  at at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
  at at android.app.ActivityThread.access$900(ActivityThread.java:169)
  at at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277)
  at at android.os.Handler.dispatchMessage(Handler.java:102)
  at at android.os.Looper.loop(Looper.java:136)
  at at android.app.ActivityThread.main(ActivityThread.java:5479)
  at ... 5 more

And the flow is the following :

Android Project - MainActivity.cs file
using System;

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

using Xamarin.Forms.Platform.Android;
using Android.Media;

namespace FormsPortable.Android{
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity {
        protected override void OnCreate (Bundle bundle){
            base.OnCreate (bundle);
            Xamarin.Forms.Forms.Init (this, bundle);
            MainApp.getInstance ().mainActivity = this;
            LoadApplication (new App ());
        }
    }
}

Shared Project - App.cs file
using System;
using Xamarin.Forms;
using System.Diagnostics;
using System.Collections.Generic;
using System.Linq;

namespace FormsPortable{
    public class App : Xamarin.Forms.Application{
        public static RootPage RootPageInstance;
        public App (){
            MainPage = GetMainPage ();
        }

        public static Page GetMainPage (){  
            RootPageInstance = RootPage.getInstance ();
            return RootPageInstance;
        }
    }
}

Shared Project - RootPage.cs file
using System;
using Xamarin.Forms;
using System.Linq;
using System.Diagnostics;

namespace FormsPortable{
    public class RootPage : MasterDetailPage{
        #region Constructor & Singleton
        private static RootPage _instance;

        public static RootPage getInstance(){
            if (_instance == null){
                Debug.WriteLine ("[RootPage] is Null. Setting up...");
                _instance = new RootPage();
            }
            return _instance;
        }
        #endregion

        public RootPage (){
            DependencyService.Get<IApp> ().WriteToConsole ("[FORMS] [RootPage] [INIT] Starting...");

            var menuPage = new MenuPage ();
            DependencyService.Get<IApp> ().WriteToConsole ("[FORMS] [RootPage] [INIT] Menu Setup.");

            Master = menuPage;
            Detail = new NavigationPage (new PG_Home ()) {
                BarBackgroundColor = Definitions.Color255,
                BarTextColor = Color.Gray,
            };

            Page loadingPage = (Page)Activator.CreateInstance (typeof(ALCBasePage), this); THIS is the line that crashes.
            Navigation.PushModalAsync(loadingPage, true);

            DependencyService.Get<IApp> ().WriteToConsole ("[FORMS] [RootPage] [INIT] Done.");
        }
    }
}

Shared Project - ALCBasePage.cs file
using System;
using Xamarin.Forms;

namespace FormsPortable{
    public class ALCBasePage : ContentPage{
        private ActivityIndicator indicator;

        public ALCBasePage (){
            InitALCPage (null);
        }

        public ALCBasePage (object parameter = null){
            InitALCPage (parameter);
        }
        private void InitALCPage(object parameter = null){

            BackgroundColor = Definitions.Color255;

            indicator = new ActivityIndicator{
                HorizontalOptions = LayoutOptions.CenterAndExpand,
                VerticalOptions = LayoutOptions.CenterAndExpand,
                Color = Color.Black,
                IsVisible = false 
            };
            indicator.WidthRequest = 35;
            indicator.HeightRequest = 35;

            IsBusyLoading (true);

            string lbl = Definitions.Translation ("TR-00001");
            if (parameter != null)
                lbl = parameter as string;
            Title = lbl;
        }

        public void IsBusyLoading(bool state){

            Content = new StackLayout {
                Children = { 
                    indicator
                }
            };

            indicator.IsRunning = state; 
            indicator.IsVisible = state;
        }
    }
}

1. Why is the Constructor not found ?
2. Why would it work for iOS and not for Android ?

Could please someone point me in the right direction. Have a deliverable today.