Question Unable to build using custom gradle

My project was edited using Unity 2017.1.1 and for the build system, we were using Internal (Default) and there was no problem. However, since we introduced a new plugin into the project, we were told that it was unable to build until we added multidex. So the build system was changed to Gradle (New) and a custom gradle was made. After several attempts of editing the gradle, it was still unable to build. I even exported and copied the build.gradle of the old project before changing and it still did not work. So here is the error:

Code (JavaScript):

1. CommandInvokationFailure: Gradle build failed.
2. C:/Program Files/Java/jdk1.8.0_191\bin\java.exe -classpath "C:\Program Files\Unity\Hub\Editor\2017.1.1f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-2.14.jar" org.gradle.launcher.GradleMain "assembleRelease"
3.  
4. stderr[
5. C:\Users\3Circles\Documents\Unity\CirclAppSourceCode VRLCS\Temp\gradleOut\mediarouter\build\intermediates\bundles\release\res\values\values.xml:164: AAPT: Error retrieving parent for item: No resource found that matches the given name 'Widget.AppCompat.Light.ActionButton'.
6.    
7. C:\Users\3Circles\Documents\Unity\CirclAppSourceCode VRLCS\Temp\gradleOut\mediarouter\build\intermediates\bundles\release\res\values\values.xml:168: AAPT: Error retrieving parent for item: No resource found that matches the given name 'Widget.AppCompat.ActionButton'.
8.    
9.  
10. FAILURE: Build failed with an exception.
11.  
12. * What went wrong:
13. Execution failed for task ':mediarouter:processReleaseResources'.
14. > com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Users\3Circles\AppData\Local\Android\Sdk\build-tools\30.0.2\aapt.exe'' finished with non-zero exit value 1
15.  
16. * Try:
17. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
18. ]
19. stdout[
20. Incremental java compilation is an incubating feature.
21. :preBuild UP-TO-DATE
22. :preReleaseBuild UP-TO-DATE
23. :checkReleaseManifest
24. :preDebugBuild UP-TO-DATE
25. :appcompat:preBuild UP-TO-DATE
26. :appcompat:preReleaseBuild UP-TO-DATE
27. :appcompat:compileReleaseNdk UP-TO-DATE
28. :appcompat:compileLint
29. :appcompat:copyReleaseLint UP-TO-DATE
30. :appcompat:mergeReleaseProguardFiles
31. :appcompat:packageReleaseRenderscript UP-TO-DATE
32. :appcompat:checkReleaseManifest
33. :appcompat:prepareReleaseDependencies
34. :appcompat:compileReleaseRenderscript
35. :appcompat:generateReleaseResValues
36. :appcompat:generateReleaseResources
37. :appcompat:packageReleaseResources
38. :appcompat:compileReleaseAidl
39. :appcompat:generateReleaseBuildConfig
40. :appcompat:mergeReleaseShaders
41. :appcompat:compileReleaseShaders
42. :appcompat:generateReleaseAssets
43. :appcompat:mergeReleaseAssets
44. :appcompat:processReleaseManifest
45. :appcompat:processReleaseResources
46. :appcompat:generateReleaseSources
47. :appcompat:incrementalReleaseJavaCompilationSafeguard
48. :appcompat:compileReleaseJavaWithJavac
49. :appcompat:processReleaseJavaRes UP-TO-DATE
50. :appcompat:transformResourcesWithMergeJavaResForRelease
51. :appcompat:transformClassesAndResourcesWithSyncLibJarsForRelease
52. :appcompat:mergeReleaseJniLibFolders
53. :appcompat:transformNative_libsWithMergeJniLibsForRelease
54. :appcompat:transformNative_libsWithSyncJniLibsForRelease
55. :appcompat:bundleRelease
56. :google-play-services_lib:preBuild UP-TO-DATE
57. :google-play-services_lib:preReleaseBuild UP-TO-DATE
58. :google-play-services_lib:compileReleaseNdk UP-TO-DATE
59. :google-play-services_lib:compileLint
60. :google-play-services_lib:copyReleaseLint UP-TO-DATE
61. :google-play-services_lib:mergeReleaseProguardFiles
62. :google-play-services_lib:packageReleaseRenderscript UP-TO-DATE
63. :google-play-services_lib:checkReleaseManifest
64. :google-play-services_lib:prepareReleaseDependencies
65. :google-play-services_lib:compileReleaseRenderscript
66. :google-play-services_lib:generateReleaseResValues
67. :google-play-services_lib:generateReleaseResources
68. :google-play-services_lib:packageReleaseResources
69. :google-play-services_lib:compileReleaseAidl
70. :google-play-services_lib:generateReleaseBuildConfig
71. :google-play-services_lib:mergeReleaseShaders
72. :google-play-services_lib:compileReleaseShaders
73. :google-play-services_lib:generateReleaseAssets
74. :google-play-services_lib:mergeReleaseAssets
75. :google-play-services_lib:processReleaseManifest
76. :google-play-services_lib:processReleaseResources
77. :google-play-services_lib:generateReleaseSources
78. :google-play-services_lib:incrementalReleaseJavaCompilationSafeguard
79. :google-play-services_lib:compileReleaseJavaWithJavac
80. :google-play-services_lib:processReleaseJavaRes UP-TO-DATE
81. :google-play-services_lib:transformResourcesWithMergeJavaResForRelease
82. :google-play-services_lib:transformClassesAndResourcesWithSyncLibJarsForRelease
83. :google-play-services_lib:mergeReleaseJniLibFolders
84. :google-play-services_lib:transformNative_libsWithMergeJniLibsForRelease
85. :google-play-services_lib:transformNative_libsWithSyncJniLibsForRelease
86. :google-play-services_lib:bundleRelease
87. :mediarouter:preBuild UP-TO-DATE
88. :mediarouter:preReleaseBuild UP-TO-DATE
89. :mediarouter:compileReleaseNdk UP-TO-DATE
90. :mediarouter:compileLint
91. :mediarouter:copyReleaseLint UP-TO-DATE
92. :mediarouter:mergeReleaseProguardFiles
93. :mediarouter:packageReleaseRenderscript UP-TO-DATE
94. :mediarouter:checkReleaseManifest
95. :mediarouter:prepareReleaseDependencies
96. :mediarouter:compileReleaseRenderscript
97. :mediarouter:generateReleaseResValues
98. :mediarouter:generateReleaseResources
99. :mediarouter:packageReleaseResources
100. :mediarouter:compileReleaseAidl
101. :mediarouter:generateReleaseBuildConfig
102. :mediarouter:mergeReleaseShaders
103. :mediarouter:compileReleaseShaders
104. :mediarouter:generateReleaseAssets
105. :mediarouter:mergeReleaseAssets
106. :mediarouter:processReleaseManifest
107. :mediarouter:processReleaseResources FAILED
108.  
109. BUILD FAILED
110.  
111. Total time: 13.4 secs
112. ]
113. exit code: 1
114. UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
115. UnityEditor.Android.GradleWrapper.RunJava (System.String args, System.String workingdir, UnityEditor.Android.Progress progress)
116. Rethrow as GradleInvokationException: Gradle build failed
117. UnityEditor.Android.GradleWrapper.RunJava (System.String args, System.String workingdir, UnityEditor.Android.Progress progress)
118. UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, UnityEditor.Android.Progress progress)
119. UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
120. UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
121. UnityEditor.HostView:OnGUI()

Here is the gradle:

Code (JavaScript):

1. buildscript {
2.     repositories {
3.         jcenter()
4.     }
5.  
6.     dependencies {
7.         classpath 'com.android.tools.build:gradle:2.1.0'
8.     }
9. }
10.  
11. allprojects {
12.    repositories {
13.       flatDir {
14.         dirs 'libs'
15.       }
16.    }
17. }
18.  
19. apply plugin: 'com.android.application'
20.  
21. dependencies {
22.     compile fileTree(dir: 'libs', include: ['*.jar'])
23.     compile(name: 'android-device-names-1.1.9', ext:'aar')
24.     compile(name: 'GoogleCastRemoteDisplay', ext:'aar')
25.     compile(name: 'gvr-keyboard', ext:'aar')
26.     compile(name: 'gvr-keyboardsupport-release', ext:'aar')
27.     compile(name: 'gvr-permissionsupport-release', ext:'aar')
28.     compile(name: 'gvr', ext:'aar')
29.     compile(name: 'unityandroidpermissions', ext:'aar')
30.     compile(name: 'unitygvr', ext:'aar')
31.     compile project(':appcompat')
32.     compile project(':google-play-services_lib')
33.     compile project(':mediarouter')
34.     compile project(':unity-android-resources')
35. }
36.  
37. android {
38.     compileSdkVersion 30
39.     buildToolsVersion '30.0.2'
40.  
41.     defaultConfig {
42.         targetSdkVersion 30
43.         applicationId 'com.ooovr.offlinebeta'
44.     }
45.  
46.     lintOptions {
47.         abortOnError false
48.     }
49.  
50.     buildTypes {
51.           debug {
52.              minifyEnabled false
53.              useProguard false
54.              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'
55.               jniDebuggable true
56.           }
57.           release {
58.              minifyEnabled true
59.              useProguard true
60.               proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'
61.           }
62.     }
63.  
64. }
65.  

I think it may be due to either Appcompat or MediaRouter. They are currently inside the Plugins/Android folder and they both have their own folder with libs, res folders, etc. I tried to change the dependencies to compile files or fileTree but they still didn't work. What can I do about them?

 

Is there a way to check the Appcompat version?