gradle build failed

please how can i fix this error

Code (CSharp):

1. CommandInvokationFailure: Gradle build failed.
2. C:/Program Files/Unity/Hub/Editor/2019.4.33f1/Editor/Data/PlaybackEngines/AndroidPlayer\OpenJDK\bin\java.exe -classpath "C:\Program Files\Unity\Hub\Editor\2019.4.33f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-5.1.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"
3.  
4. stderr[
5.  
6. FAILURE: Build failed with an exception.
7.  
8. * Where:
9. Build file 'C:\Users\mali\Desktop\1\Build 2_ AutismVR\Temp\gradleOut\launcher\build.gradle' line: 3
10.  
11. * What went wrong:
12. A problem occurred evaluating project ':launcher'.
13. > Failed to apply plugin [id 'com.android.application']
14.    > Cannot parse project property android.enableR8='' of type 'class java.lang.String' as boolean. Expected 'true' or 'false'.
15.  
16. * Try:
17. 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.
18.  
19. * Get more help at https://help.gradle.org
20.  
21. BUILD FAILED in 1m 39s
22. Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
23. ]
24. stdout[
25. Starting a Gradle Daemon, 1 incompatible Daemon could not be reused, use --status for details
26. ]
27. exit code: 1
28. UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <a62274e3cf264793ab003fc3e81fb523>:0)
29. UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <a62274e3cf264793ab003fc3e81fb523>:0)
30. UnityEditor.Android.Command.Run (System.String command, System.String args, System.String workingdir, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at <a62274e3cf264793ab003fc3e81fb523>:0)
31. UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action`1[T] progress, System.String error) (at <a62274e3cf264793ab003fc3e81fb523>:0)
32. UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1[T] progress) (at <a62274e3cf264793ab003fc3e81fb523>:0)
33. Rethrow as GradleInvokationException: Gradle build failed
34. UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1[T] progress) (at <a62274e3cf264793ab003fc3e81fb523>:0)
35. UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <a62274e3cf264793ab003fc3e81fb523>:0)
36. UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <a62274e3cf264793ab003fc3e81fb523>:0)
37. Rethrow as BuildFailedException: Exception of type 'UnityEditor.Build.BuildFailedException' was thrown.
38. UnityEditor.Android.PostProcessor.CancelPostProcess.AbortBuild (System.String title, System.String message, System.Exception ex) (at <a62274e3cf264793ab003fc3e81fb523>:0)
39. UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at <a62274e3cf264793ab003fc3e81fb523>:0)
40. 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 <a62274e3cf264793ab003fc3e81fb523>:0)
41. UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <a62274e3cf264793ab003fc3e81fb523>:0)
42. 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 <3d6d6a4a6d7c4ec2aa654b7d8f54a096>:0)
43. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
44.  

 

Has it been solved？

 

i had to use an older version of unity to build for android 6.
The problem occurred while using the current version of unity to build for android 6

 

I use unity 2020 no problem, downgraded to unity 2019 error