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【Unity】「Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.」

Unity

概要

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.
-----------
* Where:
Script 'XXXX/Library/Bee/Android/Prj/IL2CPP/Gradle/launcher/setupSymbols.gradle' line: 6

* What went wrong:
A problem occurred evaluating script.
> A problem occurred configuring project ':unityLibrary'.
   > Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
      > Namespace not specified. Specify a namespace in the module's build file. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.
        
        If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.
==============================================================================

2: Task failed with an exception.
-----------
* What went wrong:
A problem occurred configuring project ':launcher'.
> compileSdkVersion is not specified. Please add it to build.gradle

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.
==============================================================================

BUILD FAILED in 39s

UnityEditor.BuildPipeline:BuildPlayer (UnityEditor.BuildPlayerOptions)

Firebase を使用している Unity プロジェクトを
Unity 6 にアップデートして Android ビルドしたら
上記のエラーが発生してビルドに失敗する現象に遭遇した。

Assets/Plugins/Android/mainTemplate.gradle

上記のファイルを削除してから

Unity メニューの
「Assets > External Dependency Manager > Android Resolver > Force Resolve」を
実行して Android ビルドしたら正常にビルドできるようになった。