c# - Exception while loading assemblies Xamarin.Android.Support.v4 -

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i working on visual studio xamarin.forms, following error:

exception while loading assemblies: system.io.filenotfoundexception: not load assembly 'xamarin.android.support.v4, version=1.0.0.0, culture=neutral, publickeytoken='. perhaps doesn't exist in mono android profile? file name: 'xamarin.android.support.v4.dll' @ xamarin.android.tuner.directoryassemblyresolver.resolve(assemblynamereference reference, readerparameters parameters) @ xamarin.android.tasks.resolveassemblies.addassemblyreferences(icollection`1 assemblies, assemblydefinition assembly, boolean toplevel) @ xamarin.android.tasks.resolveassemblies.execute() sportbook.droid

what should do?

go nuget , update xamarin android support library -v4 package, , in cases need update xamarin.forms library, more info check following link:

https://forums.xamarin.com/discussion/26685/xamarin-forms-filenotfoundexception-xamarin-android-support-v4

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