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Issue
The behavior implemented in the
<GetAdditionalResourcesFromAssemblies/> MSBuild task is no longer
supported.
This MSBuild task is a precursor to Xamarin.Build.Download that enables downloading of Android packages from the internet.
Libraries using any of the following custom assembly-level attributes will encounter this error:
IncludeAndroidResourcesFromAttributeNativeLibraryReferenceAttributeJavaLibraryReferenceAttribute
Solution
The Xamarin Support Libraries, can be simply updated to a newer version on NuGet.
Library authors will need to remove usage of these attributes. Their functionality was removed in .NET for Android 10.2.