Package error

I have a problem with package project to ETC2(Android)
Screen of log:

Text of error: UATHelper: Packaging (Android (ETC2)): Y:\app\src\main\java\com\epicgames\ue4\GameActivity.java:3531: error: cannot find symbol.

What i need to do?

I think you must setup your project first
link text

I arleady setup this

open Android Studio (3.5.3) and install SDK API lvl 29

and you must config Android SDK

333805-sdk.jpg