Android Gradle Build Failed

I tried to update my Unity version from 2017.1.1 to 2018.2.13 for my old project today. While trying to build the Android apk, I encountered this error:

Code (CSharp):

1. CommandInvokationFailure: Gradle build failed.
2. C:/Program Files/Java/jdk1.8.0_191\bin\java.exe -classpath "C:\Program Files\Unity\Hub\Editor\2018.2.13f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.2.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx2048m" "assembleDebug"
3.  
4. stderr[
5.  
6. FAILURE: Build failed with an exception.
7.  
8. * What went wrong:
9. Execution failed for task ':appcompat:packageDebugResources'.
10. > There were multiple failures while executing work items
11.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
12.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_paste_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
13.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
14.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_copy_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
15.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
16.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_share_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
17.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
18.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_copy_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
19.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
20.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_paste_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
21.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
22.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_ab_back_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
23.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
24.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_ab_back_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
25.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
26.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_share_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
27.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
28.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_cut_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
29.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
30.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_ab_back_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
31.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
32.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_voice_search_api_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
33.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
34.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_clear_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
35.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
36.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_go_search_api_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
37.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
38.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_voice_search_api_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
39.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
40.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_clear_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
41.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
42.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_cut_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
43.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
44.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_overflow_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
45.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
46.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_ab_back_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
47.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
48.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_ab_back_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
49.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
50.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_voice_search_api_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
51.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
52.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_paste_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
53.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
54.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_voice_search_api_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
55.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
56.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_selectall_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
57.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
58.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_selectall_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
59.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
60.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_selectall_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
61.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
62.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_clear_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
63.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
64.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_paste_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
65.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
66.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_share_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
67.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
68.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_copy_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
69.   > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
70.      > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_go_search_api_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
71.    > A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
72.       > Error while processing C:\Users\3Circles\Documents\Unity\CirclAppSourceCode Security new version\Temp\gradleOut\appcompat\res\drawable\abc_ic_menu_cut_material.xml : Can't process attribute android:fillColor="@android:color/white": references to other resources are not su<message truncated>

By looking at the error messages, it looks like the problem was from a line which is

android:fillColor="@android:color/white"

from multiple xml files in the gradleOut folder. However, since the gradleOut folder was generated by Unity itself when I built the apk, how do I fix it? Is it a bug of Unity? Or are my JDK, SDK or NDK not in correct versions?

 

No one has any idea? I guess it's a bug then...