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環境 Android Studio 4.2.2 エラー内容 新規プロジェクトを作成した時，あるいはRun 'app'をした時に，以下のエラーが発生する場合があります． Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager. 対処法 以下のようにapp/build.gradleを書き換えることでエラーを解決できます． 変更前 app/build.gradle android { compileSdkVersion 31 buildToolsVersion "31.0.0" defaultConfig { applicationId "app.myouji.nickname.myapplication" minSdkVersion 21 targetSdkVersion 31 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" } ~ 省略 ~ } 変更後 app/build.gradle android { compileSdkVersion 31 buildToolsVersion "30.0.3" //変更 defaultConfig { applicationId "app.myouji.nickname.myapplication" minSdkVersion 21 targetSdkVersion 30 //変更 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" } ~ 省略 ~ } 参考記事 Android Studio error “Installed Build Tools revision 31.0.0 is corrupted” Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager. が表示され、ビルドが失敗する