While implementing Maps in Xamarin, I got following Error - xamarin

Error: Could not load file or assembly 'Xamarin.Forms.Xaml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies

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Following quick start but can't get it to run

I am following the QuickStart to get a Server + Dashboard going. First I tried using .NET 6 and the .NET Core 3.1 but in both cases, when the code gets to
.UseEndpoints(....
in Startup.cs,
I get this set of exceptions
'Unable to load one or more of the requested types.
Could not load type 'Elsa.Metadata.ActivityDescriptor' from assembly 'Elsa.Core, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Services.Models.IActivity' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Models.WorkflowDefinitionVersion' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Models.WorkflowDefinitionVersion' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Models.WorkflowDefinitionVersion' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Models.WorkflowDefinitionVersion' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Models.WorkflowDefinitionVersion' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'Elsa.Models.WorkflowDefinitionVersion' from assembly 'Elsa.Abstractions, Version=2.7.0.0, Culture=neutral, PublicKeyToken=null'.'
I followed the QuickStart line by line and can't see anything wrong.

ImageCropper.forms getting error's

Keep getting this error can't compile because of it, any help?
Duplicate Java type found! Mappings between managed types and Java types must be unique. First Type: 'Com.Theartofdev.Edmodo.Cropper.CropImageView+IOnSetImageUriCompleteListenerImplementor, Binding_AndroidImageCropper, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Xamarin.Android.ImageCropper.CropImageView+IOnSetImageUriCompleteListenerImplementor, Xamarin.Android.ImageCropper, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ParTimers.Android

Visual Studio update 15.7.2 breaks Xamarin Android project

After updating Visual Studio, I can no longer build the release version of my Xamarin project:
1>Foobar.Android ->
C:\Apps\foobar-telerik-mobile-app\foobar\Android\bin\Release\foobar.Android.dll1>No
way to resolve conflict between "mscorlib, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089" and "mscorlib,
Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e".
Choosing "mscorlib, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089" arbitrarily.1>The
"LinkAssemblies" task failed
unexpectedly.1>Mono.Linker.MarkException: Error processing method:
'System.Void
Telerik.XamarinForms.DataGrid.RadDataGridResourceDictionary::InitializeComponent()'
in assembly: 'Telerik.XamarinForms.DataGrid.dll' --->
Mono.Cecil.ResolutionException: Failed to resolve
System.Func`2
Xamarin.Forms.Internals.ResourceLoader::get_ResourceProvider()
If the Android option "Use Shared Runtime" is true, it will build - except you cannot publish with that option set! So there is no point.
I have no idea how to fix this. Any Microsoft/Xamarin/Telerik insiders out there with some ideas?

DrawerLayout Exists in Both Support.Core.UI and V4.Widget

I had a project with a DrawerLayout using Android.Support.Widget.v4
when i wanted to use a recyclerview and after installing Support.v7.RecyclerView and its dependencies im getting this error :
Error CS0433
'DrawerLayout' exists in 'Xamarin.Android.Support.Core.UI, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null' and 'Xamarin.Android.Support.v4,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'

Assembly created by Moles in VS2010 is referencing MVC3 and MVC4 after install of VS2012

Assembly 'dllname.Moles, Version=1.2.0.0, Culture=neutral, PublicKeyToken=null' uses 'System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher version than referenced assembly 'System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
A MVC3 solution targetting the .NET4.0 framework, with a unittest project using the Moles framework, worked perfectly in Visual Studio 2010. MVC4 was not installed on this computer.
After installation of Visual Studio 2012 (and the mandatory in place replacement of .NET4.0 by .NET4.5 and the installation of MVC4), the unittest project doesn't compile anymore in VS2010, it complains about the given error.
When we inspect the assembly, we see effectively that it is referencing MVC4 and MVC3??
BoneSoft.CSS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
itextsharp, Version=5.1.2.0, Culture=neutral, PublicKeyToken=8354ae6d2174ddca
Microsoft.ExtendedReflection, Version=0.94.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
Microsoft.Moles.Framework, Version=0.94.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
NHibernate.Validator, Version=1.3.1.4000, Culture=neutral, PublicKeyToken=70154e18752585bd
System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Runtime.Caching, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
MVC4 is never referenced in the whole solution, but Moles somewhere thinks it must be included when generating a 'moles assembly' of a assembly who is referencing MVC3.
I have also moles assemblies of other assemblies who are not referencing MVC3 and there no problem at compiling time.
I deleted already the moles assembly in the project, rebuilded and recreated the moles assembly: same error.
Ideas where to search the problem?
When you installed VS 2012, it installed MVC4 on the box. MVC 3 wont work well SxS with MVC 4. You need to update MVC 3 app to work on machine where MVC 4 is installed.This is documented in release notes for MVC 4.0. Please read section Installing ASP.NET MVC 4 breaks ASP.NET MVC 3 RTM applications. Follow setps "Required updates".
I was getting a similar error on a project so I removed the reference to MVC and re-added the reference to MVC 3, then I was able to compile.
Looking at the .csproj file, before it read:
<Reference Include="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<Private>False</Private>
</Reference>
and after re-adding the reference:
<Reference Include="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
So it looks like the tag <SpecificVersion>False</SpecificVersion> was letting the project look for the reference to the newer version of MVC, which was causing the version conflict.

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