【Unity】ビルドでエラー「com.android.dex.DexException: Multiple dex files define」

とあるassetを追加後に発生しました。

原因はjarなり、aarなりが重複している事。追加されたファイルを確認し、似たような名前のjarやaarが無いか確認。合った場合、バージョンが古い方を削除すればOK。

例のごとく、assetにplay-store系のjarやaarが直接含まれている場合に起こりがちなエラー。

※例のごとくについては以下を参照 www.moyashidaisuke.com

エラーログ

CommandInvokationFailure: Gradle build failed. 
/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/bin/java -classpath "/Applications/Unity5.6/PlaybackEngines/AndroidPlayer/Tools/gradle/lib/gradle-launcher-2.14.jar" org.gradle.launcher.GradleMain "assembleDebug"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/actions/ItemListIntents;

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
]
stdout[
Incremental java compilation is an incubating feature.
:preBuild UP-TO-DATE
:preDebugBuild UP-TO-DATE
:checkDebugManifest

〜省略〜

BUILD FAILED

Total time: 1 mins 14.779 secs
]
exit code: 1
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.GradleWrapper.RunJava (System.String args, System.String workingdir, UnityEditor.Android.Progress progress)
Rethrow as GradleInvokationException: Gradle build failed
UnityEditor.Android.GradleWrapper.RunJava (System.String args, System.String workingdir, UnityEditor.Android.Progress progress)
UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, UnityEditor.Android.Progress progress)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.HostView:OnGUI()