DexArchiveMergerException: Unable to merge dex

Questions & Answers
1

I’ve tried implementing unity Admob but then upon implementing the game I get error describing about Dex Archive Merger

CommandInvokationFailure: Gradle build failed. 
C:/Program Files/Java/jdk1.8.0_161\bin\java.exe -classpath "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.2.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx2048m" "assembleDebug"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformDexArchiveWithExternalLibsDexMergerForDebug'.
> java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 43s
]
stdout[
:preBuild UP-TO-DATE
:preDebugBuild
:compileDebugAidl
:compileDebugRenderscript
:checkDebugManifest
:generateDebugBuildConfig
:prepareLintJar
:generateDebugResValues
:generateDebugResources
:mergeDebugResources
:createDebugCompatibleScreenManifests
:processDebugManifest
:splitsDiscoveryTaskDebug
:processDebugResources
:generateDebugSources
:javaPreCompileDebug
:compileDebugJavaWithJavac
:compileDebugNdk NO-SOURCE
:compileDebugSources
:mergeDebugShaders
:compileDebugShaders
:generateDebugAssets
:mergeDebugAssets
:transformClassesWithDexBuilderForDebug
:transformDexArchiveWithExternalLibsDexMergerForDebug FAILED
19 actionable tasks: 19 executed
]
exit code: 1
UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action`1 progress, System.String error)
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1 progress)
Rethrow as GradleInvokationException: Gradle build failed
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1 progress)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

How do I resolve this kind of issue?

4

Looks like if you change Minimum API Level to Android 5.0 it can help with this issue. (it has some other multidex settings). This helped me.

3

I was able to fix this by going through my plugin folders and finding duplicates.

5

Go to build player settings–>Publishing settings and set Release to dropdown Gradle experimental and hit build,worked for me.

2

I also encountered the same problem. The release build is fine though. Did you find a fix?,I have encountered the same problem. Did you find a solution?

6

In my project firebase and google sigin SDK was causing this conflict I just upgraded minimum android version to 7 instead of 6 and the build worked for me.