Problem after Xamarin update

Hi there
After Xamarin update I cannot deploy the app to device (it builds Ok though):

Java.Lang.RuntimeException: Unable to instantiate activity ComponentInfo{SSCApp.Droid/md5983104ebd031e37969f76a111125273a.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "md5983104ebd031e37969f76a111125273a.MainActivity" on path: DexPathList[[zip file "/data/app/SSCApp.Droid-1/base.apk"],nativeLibraryDirectories=[/data/app/SSCApp.Droid-1/lib/arm, /vendor/lib, /system/lib]]

What can cause that?

My Visual Studio info:

Xamarin 4.8.0.754 (2a34af5)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer 4.8.183 (2577c82ea)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin.Android 8.1.0.13 (f241f51)
Visual Studio extension to enable development for Xamarin.Android.

Xamarin.Android SDK 8.1.1.1 (HEAD/5d942bd12)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS 11.6.1.2 (6857dfc)
Visual Studio extension to enable development for Xamarin.iOS.

Xamarin.iOS and Xamarin.Mac SDK 11.6.1.2 (6857dfc)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

Thanks.