Missing assembly reference build error

[onurhazar]

Hi, I have a xamarin forms app. Once I updated Xamarin and Xamarin Forms, I got a build error below;

Error CS0400: The type or namespace name 'ProgressRingControl' could not be found in the global namespace (are you missing an assembly reference?) (CS0400)

I added version 0.1.2 from nuget for both iOS&Android&Forms projects.

Visual Studio Community 2019 for Mac
Version 8.2.2 (build 21)
Installation UUID: 4482ac2d-ccbf-41b6-8d06-e096c840be7e
GTK+ 2.24.23 (Raleigh theme)
Xamarin.Mac 5.14.0.85 (d16-2-fix-mac-updates / 86973979)

Package version: 600000319

Mono Framework MDK
Runtime:
Mono 6.0.0.319 (2019-02/52203786470) (64-bit)
Package version: 600000319

NuGet
Version: 5.1.0.6013

.NET Core
Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
2.1.12
2.1.8
SDK: /usr/local/share/dotnet/sdk/2.1.701/Sdks
SDK Versions:
2.1.701
2.1.700
2.1.505
2.1.504
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/6.0.0/lib/mono/msbuild/Current/bin/Sdks

Xamarin.Profiler
'/Applications/Xamarin Profiler.app' not found

Updater
Version: 11

Xamarin.Android
Version: 9.4.1.0 (Visual Studio Community)
Commit: xamarin-android/d16-2/ebd65c9
Android SDK: /Users/onur.hazar/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 29.0.1
SDK Build Tools Version: 28.0.3

Build Information:
Mono: mono/mono@e6f5369c2d2
Java.Interop: xamarin/java.interop/d16-2@d64ada5
LibZipSharp: grendello/LibZipSharp/d16-2@caa0c74
LibZip: nih-at/libzip@b95cf3f
ProGuard: xamarin/proguard@905836d
SQLite: xamarin/sqlite@8212a2d
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-2@6f6c969

Microsoft Mobile OpenJDK
Java SDK: /Users/onur.hazar/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

Android Device Manager
Version: 1.2.0.58
Hash: d03e3ea
Branch: remotes/origin/d16-2~1
Build date: 2019-07-30 21:29:36 UTC

Apple Developer Tools
Xcode 10.3 (14492.2)
Build 10G8

Xamarin.Mac
Version: 5.14.0.114 (Visual Studio Community)
Hash: c6691164
Branch: d16-2
Build date: 2019-07-29 15:54:06-0400

Xamarin.iOS
Version: 12.14.0.114 (Visual Studio Community)
Hash: c6691164
Branch: d16-2
Build date: 2019-07-29 15:54:05-0400

Xamarin Designer
Version: 16.2.0.379
Hash: 3f0652957
Branch: remotes/origin/d16-2
Build date: 2019-08-01 17:32:50 UTC

Xamarin Inspector
Version: 1.4.3
Hash: db27525
Branch: 1.4-release
Build date: Mon, 09 Jul 2018 21:20:18 GMT
Client compatibility: 1

Build Information
Release ID: 802020021
Git revision: d2ffd09000c5d24a206b715b63d409e8e965689a
Build date: 2019-08-02 00:25:49+00
Build branch: release-8.2
Xamarin extensions: 4cc9cbbe68baaeb6bc654f36e057b1bd124f3f65

Operating System
Mac OS X 10.14.6
Darwin 18.7.0 Darwin Kernel Version 18.7.0
Thu Jun 20 18:42:21 PDT 2019
root:xnu-4903.270.47~4/RELEASE_X86_64 x86_64

Enabled user installed extensions
Telerik Xamarin Add-in 2019.2.513

[sethom]

I'm getting related errors after upgrading XF to 4.2.0.70924 and upgrading Visual Studio/Xamarin.iOS to the latest versions:

xxx.xaml: Error: Failed to resolve assembly: 'ProgressRing.Forms.Plugin, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'

and...

Error CS0246: The type or namespace name 'ProgressRingControl' could not be found (are you missing a using directive or an assembly reference?) (CS0246)