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While migrating a Xamarin.Forms app into .NET MAUI and fixing different issues, I'm getting "Type android.support.v4.app.INotificationSideChannel$Stub$Proxy is defined multiple times" from my Android part of the solution:

Error JAVA0000 in obj\Debug\net8.0-android\lp\144\jl\classes.jar:android/support/v4/app/INotificationSideChannel$Stub$Proxy.class:
Type android.support.v4.app.INotificationSideChannel$Stub$Proxy is defined multiple times: obj\Debug\net8.0-android\lp\144\jl\classes.jar:android/support/v4/app/INotificationSideChannel$Stub$Proxy.class, obj\Debug\net8.0-android\lp\29\jl\bin\classes.jar:android/support/v4/app/INotificationSideChannel$Stub$Proxy.class
Compilation failed
java.lang.RuntimeException: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: obj\Debug\net8.0-android\lp\144\jl\classes.jar
android/support/v4/app/INotificationSideChannel$Stub$Proxy.class
    at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:135)
    at com.android.tools.r8.D8.main(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:5)
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, origin: obj\Debug\net8.0-android\lp\144\jl\classes.jar:android/support/v4/app/INotificationSideChannel$Stub$Proxy.class
    at Version.fakeStackEntry(Version_8.2.33.java:0)
    at com.android.tools.r8.T.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:5)
    at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:82)
    at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:32)
    at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:31)
    at com.android.tools.r8.utils.S0.b(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:2)
    at com.android.tools.r8.D8.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:42)
    at com.android.tools.r8.D8.b(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:13)
    at com.android.tools.r8.D8.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:40)
    at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:122)
    ... 1 more
Caused by: com.android.tools.r8.utils.b: Type android.support.v4.app.INotificationSideChannel$Stub$Proxy is defined multiple times: obj\Debug\net8.0-android\lp\144\jl\classes.jar:android/support/v4/app/INotificationSideChannel$Stub$Proxy.class, obj\Debug\net8.0-android\lp\29\jl\bin\classes.jar:android/support/v4/app/INotificationSideChannel$Stub$Proxy.class
    at com.android.tools.r8.utils.Q2.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:21)
    at com.android.tools.r8.utils.D2.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:54)
    at com.android.tools.r8.utils.D2.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:10)
    at java.base/java.util.concurrent.ConcurrentHashMap.merge(ConcurrentHashMap.java:2056)
    at com.android.tools.r8.utils.D2.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:6)
    at com.android.tools.r8.graph.m4$a.d(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:6)
    at com.android.tools.r8.dex.c.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:61)
    at com.android.tools.r8.dex.c.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:12)
    at com.android.tools.r8.dex.c.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:9)
    at com.android.tools.r8.D8.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:45)
    at com.android.tools.r8.D8.d(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:17)
    at com.android.tools.r8.D8.c(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:69)
    at com.android.tools.r8.utils.S0.a(R8_8.2.33_429c93fd24a535127db6f4e2628eb18f2f978e02f99f55740728d6b22bef16dd:28)
        ... 6 more
Directory 'obj\Debug\net8.0-android\lp\144' is from 'androidx.core.core.aar'.

The package references from the Android project:

<PackageReference Include="CommunityToolkit.Maui.Markup" Version="4.0.0" />
<PackageReference Include="Controls.UserDialogs.Maui" Version="1.5.4" />
<PackageReference Include="IdentityModel.OidcClient" Version="6.0.0" />
<PackageReference Include="Syncfusion.Maui.Core" Version="26.1.38" />
<PackageReference Include="Xamarin.AndroidX.Activity" Version="1.9.0.3" />
<PackageReference Include="Xamarin.AndroidX.Activity.Ktx" Version="1.9.0.3" />
<PackageReference Include="Xamarin.AndroidX.Collection" Version="1.4.0.5" />
<PackageReference Include="Xamarin.AndroidX.Collection.Ktx" Version="1.4.0.4" />
<PackageReference Include="Xamarin.AndroidX.Core" Version="1.13.1.2" />
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.V4" Version="1.0.0.26" />
<PackageReference Include="Xamarin.Azure.NotificationHubs.Android" Version="1.1.4.1" />
<PackageReference Include="Xamarin.Google.Dagger" Version="2.50.0" />
<PackageReference Include="Xamarin.GooglePlayServices.Base" Version="118.4.0" />
<PackageReference Include="Microsoft.Maui.Controls" Version="8.0.60" />
<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="8.0.60" />

I have previously fixed multiple AndroidX related issues with explicit dependencies in the project file already, but this does not seem related to them.

Improve this question
5
  • Have a look at the latest packages here Commented Jun 19, 2024 at 18:49
  • I have added the package reference in your both this and last question in different new maui project. I didn't get any error and can build successfully. Did you try to close the VS and delete the obj folder then rebuild it? Commented Jun 20, 2024 at 3:39
  • In addition, you can remove all the packages about xamarin android and then add them one by one to check which package cause this error. Commented Jun 20, 2024 at 5:54
  • Yes, I've previously tried closing VS, deleting build output, and running dotnet restore and dotnet build without success. Won't I just get the previous errors instead? Commented Jun 20, 2024 at 13:15
  • You can have a try because I can't reproduce your problem. Those packages worked well in new maui project. Commented Jun 21, 2024 at 5:50

1 Answer 1

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The only way I managed to recover from this error was to clone the Visual Studio solution code, from bitbucket repository that I was working from. I started in a brand new folder. The only thing I was missing was a few lines of code from the day I'd been working on it.

This worked for me and was a quicker solution that all the others I've read and should save hours/days of searching for a answer to this problem.

Hope this helps others.

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1 Comment

Since this I've got the same error back so maybe not the right solution

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