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arcore android arm64 error packaging

hi
i’ve been creating an app for android using arcore augmented faces and it works well
except that it throws erros when trying to create the apk for arm64 ,
for armv7 has no problems but google play store is asking me for a 64 version of the apk so
im stuck with this kind of error:


[2020.07.31-19.48.53:748][331]UATHelper: Packaging (Android (ETC2)): > Task :app:compileDebugJavaWithJavac
[2020.07.31-19.48.53:748][331]UATHelper: Packaging (Android (ETC2)): Z:\app\src\main\java\com\google\ar\core\examples\unreal\augmentedfaces\DownloaderActivity.java:104: error: package R does not exist
[2020.07.31-19.48.53:748][331]UATHelper: Packaging (Android (ETC2)): int stringResourceID = paused ? R.string.text_button_resume :
[2020.07.31-19.48.53:748][331]UATHelper: Packaging (Android (ETC2)): ^

im guessing there is an arcore library that is not compiled for arm64 ?