Type com.google.gson.FieldNamingPolicy$5 is defined multiple times

[MichaelBadDinosaur]

Describe the bug
.NET 6 MAUI project build fails with Laerdal.DFu v1.20.15 installed via Nuget

1>Exception in thread "main" java.lang.RuntimeException: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: obj\Debug\net6.0-android\lp\1\jl\__reference__gson-2.8.6.jar:com/google/gson/FieldNamingPolicy$5.class
1>	at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:98)
1>	at com.android.tools.r8.D8.main(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:4)
1>Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: obj\Debug\net6.0-android\lp\1\jl\__reference__gson-2.8.6.jar:com/google/gson/FieldNamingPolicy$5.class
1>	at Version.fakeStackEntry(Version_3.3.28.java:0)
1>	at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:75)
1>	at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:28)
1>	at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:27)
1>	at com.android.tools.r8.internal.Bj.b(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:2)
1>	at com.android.tools.r8.D8.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:22)
1>	at com.android.tools.r8.D8.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:17)
1>	at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:85)
1>	... 1 more
1>Caused by: com.android.tools.r8.internal.f: Type com.google.gson.FieldNamingPolicy$5 is defined multiple times: obj\Debug\net6.0-android\lp\1\jl\__reference__gson-2.8.6.jar:com/google/gson/FieldNamingPolicy$5.class, obj\Debug\net6.0-android\lp\151\jl\libs\ED64959F88B22E6D.jar:com/google/gson/FieldNamingPolicy$5.class
1>	at com.android.tools.r8.internal.DT.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:14)
1>	at com.android.tools.r8.internal.DT.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:22)
1>	at com.android.tools.r8.internal.CN.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:33)
1>	at com.android.tools.r8.internal.CN.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:10)
1>	at java.base/java.util.concurrent.ConcurrentHashMap.merge(ConcurrentHashMap.java:2048)
1>	at com.android.tools.r8.internal.CN.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:6)
1>	at com.android.tools.r8.graph.B2$a.e(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:4)
1>	at com.android.tools.r8.dex.b.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:105)
1>	at com.android.tools.r8.dex.b.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:28)
1>	at com.android.tools.r8.D8.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:25)
1>	at com.android.tools.r8.D8.d(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:606)
1>	at com.android.tools.r8.D8.c(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:1)
1>	at com.android.tools.r8.internal.Bj.a(R8_3.3.28_2aaf796388b4e9f6bed752d926eca110512a53a3f09a8d755196089c1cfdf799:24)
1>	... 5 more
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\32.0.448\tools\Xamarin.Android.D8.targets(79,5): error : java.lang.RuntimeException: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: obj\Debug\net6.0-android\lp\1\jl\__reference__gson-2.8.6.jar : com/google/gson/FieldNamingPolicy$5.class
1>Done building project "MauiApp1.csproj" -- FAILED.

To Reproduce
Steps to reproduce the behavior:

1. Open Visual Studio and create a .NET MAUI APP
2. Install Laerdal.DFu v1.20.15 installed via Nuget
3. Rebuild solution

Desktop (please complete the following information):
Microsoft Visual Studio Community 2022 (64-bit) - Version 17.3.3
Windows 11 Pro

[ianbaddino]

any update on this?

[turbo25mike]

I am just now switching to MAUI and see this issue. Did anyone find a work around for this?

[VNGames]

Same on Xamarin

But I fixed it by removing Google.Json nuget I have added earlier (don't remember for what and why)