How to fix ''Gradle Build Failed'' on Unity?

Question

I'm trying to build my android app for a while and can't seem to find any solution for this problem: Image

Unity Version: Unity 2020.3.21f1 (64-bit) JDK, SDK, NDK and Gradle used are Unity's recommended ones (already tried to use other ones).

The console details are here:

Configure project :launcher
WARNING: The option setting 'android.enableR8=false' is deprecated.
It will be removed in version 5.0 of the Android Gradle plugin.
You will no longer be able to disable R8

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)`

    FAILURE: Build failed with an exception.

    * What went wrong:
    com/sun/istack/FinalArrayList
    
    * 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.

    CommandInvokationFailure: Gradle build failed. 
    C:\Program Files\Unity\Hub\Editor\2020.3.21f1\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK\bin\java.exe -classpath "C:\Program Files\Unity\Hub\Editor\2020.3.21f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-6.1.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"
    
    stderr[
    
    FAILURE: Build failed with an exception.

    Build completed with a result of 'Failed' in 60 seconds (59527 ms)
    UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

UnityEditor.BuildPlayerWindow+BuildMethodException: 4 errors
  at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002ca] in <208f92fc783546f9abbe643bfc23920c>:0 
  at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <208f92fc783546f9abbe643bfc23920c>:0 
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

I already tried all tutorials on youtube and other forums, but every help is welcome, thanks!

Edit 1:

After trying Jaimin's solution this is happening now:

Assets/Plugins/Android\gradleTemplate.properties file is using a deprecated way of controlling which tool should be used to do the minification. To fix this, remove "useProguard" entries yourself. If not fixed, your build can fail.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)


 File C:\Users\Windows\.android\repositories.cfg could not be loaded.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Starting a Gradle Daemon, 1 incompatible Daemon could not be reused, use --status for details

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

FAILURE: Build failed with an exception.

* What went wrong:
com/sun/istack/FinalArrayList
> com.sun.istack.FinalArrayList

* 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 5s
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

CommandInvokationFailure: Gradle build failed. 
C:\Program Files\Unity\Hub\Editor\2020.3.21f1\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK\bin\java.exe -classpath "C:\Program Files\Unity\Hub\Editor\2020.3.21f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-6.1.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
com/sun/istack/FinalArrayList
> com.sun.istack.FinalArrayList

* 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 5s
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
]
stdout[
Starting a Gradle Daemon, 1 incompatible Daemon could not be reused, use --status for details
]
exit code: 1
UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.Command.Run (System.String command, System.String args, System.String workingdir, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action`1[T] progress, System.String error) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1[T] progress) (at <f94168442e634613b6a5965ed17c38f4>:0)
Rethrow as GradleInvokationException: Gradle build failed
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1[T] progress) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <f94168442e634613b6a5965ed17c38f4>:0)
Rethrow as BuildFailedException: Exception of type 'UnityEditor.Build.BuildFailedException' was thrown.
UnityEditor.Android.PostProcessor.CancelPostProcess.AbortBuild (System.String title, System.String message, System.Exception ex) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (UnityEditor.BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <f94168442e634613b6a5965ed17c38f4>:0)
UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <208f92fc783546f9abbe643bfc23920c>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

Build completed with a result of 'Failed' in 127 seconds (127448 ms)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

UnityEditor.BuildPlayerWindow+BuildMethodException: 5 errors
  at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002ca] in <208f92fc783546f9abbe643bfc23920c>:0 
  at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <208f92fc783546f9abbe643bfc23920c>:0 
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

And here's how the Custom Gradle Properties Template file is coded:

org.gradle.jvmargs=-Xmx**JVM_HEAP_SIZE**M
org.gradle.parallel=true
unityStreamingAssets=.unity3d**STREAMING_ASSETS**
**ADDITIONAL_PROPERTIES**

Answer 1

This is because android.enableR8 is deprecated. To remove it from your gradle.properties file you have to go to Project Settings > Player > Android (Tab) > Other Settings > and check Custom Gradle Properties Template.

After that, a gradleTemplate.properties file is generated at:

Assets/Plugins/Android/gradleTemplate.properties

In this file, remove line android.enableR8, or comment it out, and now make new fresh build.

This trick should work.

Alternatively, export as an Android project and then change it in Android Studio. In Android Studio, you have more control on these things.

Answer 2

Install a new version of Unity, it will work

You can use the Unity 2020.3.33f1 version, that's the one I use, and it works fine.

Remember to set to Preferences: Unity default JDK, Gradle, NDK

Answer 3

I have seen in a lot of places and the issue is really painfull. In my case, my problem it was that there was an old CSharp interface of mine incorrect that wasn't in my csproj, so I couldn't see in my Visual Studio.

As Unity doesn't care about csproj, it uses it in compilation. I just noticed because of an inexistent java issue shown in Console window (because of Android, the CSharp was converted to Java and for this reason Graddle threw the issue).

Try to find in your CSharp program some class that doesn't appear in Solution Explorer in Visual Studio and remove or fix it.

Also, I followed the fix indicated above by Jaimin. It didn't work for me, but I left like that. It makes way more sense with it.