ReactiveUI build errors related to deprecated Nuget.Protocol.Core.v3

[jmegner]

When trying to build the advanced-topics/ReactiveUI UWP project, I get the build errors quoted below. One suspicious thing is use of deprecated nuget package Nuget.Protocol.Core.v3 and it shows up a lot in the build errors.

I'm using Visual Studio 2019 Professional 16.7.2 and I can build all the other Prism sample projects I've tried so far.

NU1605: Detected package downgrade: System.Collections from 4.3.0 to 4.0.11. Reference the package directly from the project to select a different version. 
 PrismSample.UWP -> PrismSample -> NuGet.Protocol.Core.v3 4.2.0 -> NuGet.Protocol.Core.Types 4.2.0 -> System.Net.Http 4.1.0 -> System.Net.Primitives 4.0.11 -> runtime.win.System.Net.Primitives 4.3.0 -> System.Collections (>= 4.3.0) 
 PrismSample.UWP -> PrismSample -> NuGet.Protocol.Core.v3 4.2.0 -> NuGet.Protocol.Core.Types 4.2.0 -> System.Net.Http 4.1.0 -> System.Collections (>= 4.0.11)
NU1605: Detected package downgrade: System.Diagnostics.Tracing from 4.3.0 to 4.1.0. Reference the package directly from the project to select a different version. 
 PrismSample.UWP -> PrismSample -> NuGet.Protocol.Core.v3 4.2.0 -> NuGet.Protocol.Core.Types 4.2.0 -> System.Net.Http 4.1.0 -> System.Net.Primitives 4.0.11 -> runtime.win.System.Net.Primitives 4.3.0 -> System.Diagnostics.Tracing (>= 4.3.0) 
 PrismSample.UWP -> PrismSample -> NuGet.Protocol.Core.v3 4.2.0 -> NuGet.Protocol.Core.Types 4.2.0 -> System.Net.Http 4.1.0 -> System.Diagnostics.Tracing (>= 4.1.0)
[Lots more of NU1605 stuff omitted]
1>------ Build started: Project: PrismSample, Configuration: Debug Any CPU ------
1>C:\Users\jegner\.nuget\packages\pharmacist.msbuild\1.6.4\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : PharmacistNuGetTask: Package NuGet.Client does not have a valid Version.
1>C:\Users\jegner\.nuget\packages\pharmacist.msbuild\1.6.4\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : PharmacistNuGetTask: Package NuGet.Protocol.Core.v3 does not have a valid Version.
1>C:\Users\jegner\.nuget\packages\pharmacist.msbuild\1.6.4\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : PharmacistNuGetTask: Package Prism.DryIoc.Forms does not have a valid Version.
1>C:\Users\jegner\.nuget\packages\pharmacist.msbuild\1.6.4\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : PharmacistNuGetTask: Package ReactiveUI.XamForms does not have a valid Version.
1>C:\Users\jegner\.nuget\packages\pharmacist.msbuild\1.6.4\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : PharmacistNuGetTask: Package Xamarin.Forms does not have a valid Version.
1>C:\Users\jegner\.nuget\packages\pharmacist.msbuild\1.6.4\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : PharmacistNuGetTask: Package Xamarin.Essentials does not have a valid Version.
1>C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\Views\NugetPackageDetailPage.xaml.cs(28,18,28,24): error CS1061: 'ListView' does not contain a definition for 'Events' and no accessible extension method 'Events' accepting a first argument of type 'ListView' could be found (are you missing a using directive or an assembly reference?)
1>C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\Views\NugetPackageListPage.xaml.cs(41,18,41,24): error CS1061: 'ListView' does not contain a definition for 'Events' and no accessible extension method 'Events' accepting a first argument of type 'ListView' could be found (are you missing a using directive or an assembly reference?)
1>C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\Views\NugetPackageListPage.xaml.cs(49,18,49,24): error CS1061: 'ListView' does not contain a definition for 'Events' and no accessible extension method 'Events' accepting a first argument of type 'ListView' could be found (are you missing a using directive or an assembly reference?)
1>C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\Views\NugetPackageListPage.xaml.cs(57,18,57,24): error CS1061: 'ListView' does not contain a definition for 'Events' and no accessible extension method 'Events' accepting a first argument of type 'ListView' could be found (are you missing a using directive or an assembly reference?)
1>C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\Services\NugetPackageService.cs(13,43,13,68): warning CS0169: The field 'NuGetPackageService._sourceRepositoryProvider' is never used
1>Done building project "PrismSample.csproj" -- FAILED.
2>------ Build started: Project: PrismSample.UWP, Configuration: Debug x86 ------
2>C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample.UWP\PrismSample.UWP.csproj : XamlCompiler error WMC1006: Cannot resolve Assembly or Windows Metadata file 'C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\bin\Debug\netstandard2.0\PrismSample.dll'
2>CSC : error CS0006: Metadata file 'C:\dev\ahg\Prism-Samples-Forms\advanced-topics\ReactiveUI\src\PrismSample\bin\Debug\netstandard2.0\PrismSample.dll' could not be found
2>C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\XamlCompiler\Microsoft.Windows.UI.Xaml.Common.targets(482,5): error MSB4181: The "CompileXaml" task returned false but did not log an error.
========== Build: 0 succeeded, 2 failed, 0 up-to-date, 0 skipped ==========
========== Deploy: 0 succeeded, 0 failed, 0 skipped ==========