Android APK Build Failing "Execution failed for task ':launcher:checkReleaseDuplicateClasses'."

Questions & Answers
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1

I’m trying to make an APK build but I’m getting the following errors:

FAILURE: Build failed with an exception.
What went wrong:
Execution failed for task ‘:launcher:checkReleaseDuplicateClasses’.
1 exception was raised by workers:
java.lang.RuntimeException: Duplicate class android.support.v4.app.INotificationSideChannel found in modules classes.jar (:androidx.core.core-1.0.0:) and classes.jar (:com.android.support.support-compat-26.1.0:)

…along with 330 other similar errors which I believe to be related. (I will leave the full error message in a comment below).

I’m not very knowledgeable about these sorts of issues so a dumbed-down solution would be appreciated.

3

I’m having the same issue, I change the Gradle Properties to use Jettifier, change the AndroidManifest.xml but still nothing, would appreciate if someone can help T_T

EDIT

I fixed it by going to Assets → Play Services Resolver → Android Resolver → Delete Resolved Libraries

2

Same for me.
I’m using Firebase and Facebook sdk. Everything works perfect on ios but i cant build on android, the only way for it to build is if i completely delete the plugins folder, but then firebase won’t start of course.

Tried using every version of 2019.3 and 2019.4 on mac, same 498 duplicate classes errors everytime.

Also tried:

  • Deleting resolved libraries
  • Resolve / Force Resolve
  • Update version handler
  • disable patch mainTemplate.gradle
  • deleting the sdk 14 or something on firebase AndroidManifest
  • updating and downgrading all plugins (now they are all in their latest version)
  • deleting library
  • deleting the folder, creating a new one and transfering packages and assets folders into it
  • restarting computer
  • everything in every thread ever

:stuck_out_tongue:

6

I use Mediation for ad. And my solution was just remove the “Advertisement” package on Package Manager from “In Project” tab.

5

I’ve fixed that issue by deleting the playcore.arr file from the Assets/GooglePlayPlugins/com.google.play.core/Runtime/Plugins folder

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184549-gladle-issue.png1024×774 88.3 KB

7

https://answers.unity.com/questions/1711904/android-apk-build-failing-execution-failed-for-tas.html,I had the same duplicate classes error but not in the same files, for me it worked deleting one of those files:
androidx.core.core-1.0.0
or
com.android.support.support-compat-26.1.0

8

The reason I was getting this error was because I had Admob imported and Unity Ads package as well. I deleted Unity Advertisements package from package manager.

I still got this error, when I searched for one of the duplicate files, it was located in my assets folder and the library folder. I closed Unity, deleted Library Folder and then reopened Unity.

It took a long time to rebuild Library folder and after that the build was finally successful.

Hope this helps someone else out struggling with this issue.