Xamarin Forms - how to fix broken build? (seems li

After installing Xamarin Forms Map, I am now getting this. I've tried to remove everything I added (the init, changes to the Manifest, etc). Gone from a working solution to a broken one that won't even compile.

Appreciate any suggestions

Tried to install current version of Xamarin.Forms.Map : 2.3.3.180

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets (_GenerateJavaStubs target) ->
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.OS.CancellationSignal+IOnCancelListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.OS.CancellationSignal+IOnCancelListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.OS.CancellationSignal.IOnCancelListenerImplementor' will refer to 'Android.Support.V4.OS.CancellationSignal+IOnCancelListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.ActionProvider+ISubUiVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.ActionProvider+ISubUiVisibilityListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.View.ActionProvider.ISubUiVisibilityListenerImplementor' will refer to 'Android.Support.V4.View.ActionProvider+ISubUiVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.ActionProvider+IVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.ActionProvider+IVisibilityListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.View.ActionProvider.IVisibilityListenerImplementor' will refer to 'Android.Support.V4.View.ActionProvider+IVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor' will refer to 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor' will refer to 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor' will refer to 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.MenuItemCompat+IOnActionExpandListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.MenuItemCompat+IOnActionExpandListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
    /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets:  warning : References to the type 'Android.Support.V4.View.MenuItemCompat.IOnActionExpandListenerImplementor' will refer to 'Android.Support.V4.View.MenuItemCompat+IOnActionExpandListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

Errors:

/Users/TESTProjects/TEST/Droid/TEST.Droid.csproj (Build) ->
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets (_CompileJava target) ->
    obj/Debug/android/src/mono/android/support/v4/app/SharedElementCallback_OnSharedElementsReadyListenerImplementor.java(8,47):  javacerror :  error: cannot find symbol

android.support.v4.app.SharedElementCallback.OnSharedElementsReadyListener
  symbol:   class OnSharedElementsReadyListener
  location: class SharedElementCallback


obj/Debug/android/src/mono/android/support/v4/view/accessibility/AccessibilityManagerCompat_AccessibilityStateChangeListenerImplementor.java(8,67):  javacerror :  error: cannot find symbol
        android.support.v4.view.accessibility.AccessibilityManagerCompat.AccessibilityStateChangeListener
  symbol:   class AccessibilityStateChangeListener
  location: class AccessibilityManagerCompat


obj/Debug/android/src/mono/android/support/v4/view/accessibility/AccessibilityManagerCompat_TouchExplorationStateChangeListenerImplementor.java(8,67):  javacerror :  error: cannot find symbol
        android.support.v4.view.accessibility.AccessibilityManagerCompat.TouchExplorationStateChangeListener
  symbol:   class TouchExplorationStateChangeListener
  location: class AccessibilityManagerCompat


obj/Debug/android/src/mono/android/support/v4/widget/SearchViewCompat_OnCloseListenerImplementor.java(8,45):  javacerror :  error: cannot find symbol
        android.support.v4.widget.SearchViewCompat.OnCloseListener
  symbol:   class OnCloseListener
  location: class SearchViewCompat

obj/Debug/android/src/mono/android/support/v4/widget/SearchViewCompat_OnQueryTextListenerImplementor.java(8,45): error :  error: cannot find symbol
        android.support.v4.widget.SearchViewCompat.OnQueryTextListener
  symbol:   class OnQueryTextListener
  location: class SearchViewCompat

I've ran into the same problem today, which seems to be related to two different dependencies from two C# projects of which one is used/referenced by the other. From what I see, there may be two different versions of the same dependency installed. Most likely, you might need to consolidate your NuGet packages. This might be what the error message is trying to say. One of the duplicated types is Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor which is contained within the two libraries Xamarin.Android.Support.v4 and Xamarin.Android.Support.Compat. At least for my solution this is due to two different versions of the Xamarin.Android.Support.v4 NuGet package, namely versions 25.3.1 and 23.3.0. Because of the dependencies of the Xamarin.Forms NuGet package, I explicitly had to downgrade to version 23.3.0 which seems to solve the problem.