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    Packaging error: cannot find symbol

    I'm using 4.23.1 and CodeWorks 1R7. I'm trying to package my game but it keep fails. I have literally no idea with this.


    Code:
    UATHelper: 패키징 (Android (ETC1)): Z:\app\src\main\java\com\epicgames\ue4\GameApplication.java:7: error: cannot find symbol
    UATHelper: 패키징 (Android (ETC1)): import android.arch.lifecycle.ProcessLifecycleOwner;
    UATHelper: 패키징 (Android (ETC1)): ^
    UATHelper: 패키징 (Android (ETC1)): symbol: class ProcessLifecycleOwner
    UATHelper: 패키징 (Android (ETC1)): location: package android.arch.lifecycle
    UATHelper: 패키징 (Android (ETC1)): Z:\app\src\main\java\com\epicgames\ue4\GameApplication.java:22: error: cannot find symbol
    UATHelper: 패키징 (Android (ETC1)): ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
    UATHelper: 패키징 (Android (ETC1)): ^
    UATHelper: 패키징 (Android (ETC1)): symbol: variable ProcessLifecycleOwner
    UATHelper: 패키징 (Android (ETC1)): location: class GameApplication
    UATHelper: 패키징 (Android (ETC1)): Note: Some input files use or override a deprecated API.
    UATHelper: 패키징 (Android (ETC1)): :app:compileDebugJavaWithJavac FAILED
    UATHelper: 패키징 (Android (ETC1)): Note: Recompile with -Xlint:deprecation for details.
    UATHelper: 패키징 (Android (ETC1)): 2 errors
    UATHelper: 패키징 (Android (ETC1)): FAILURE: Build failed with an exception.
    UATHelper: 패키징 (Android (ETC1)): * What went wrong:
    UATHelper: 패키징 (Android (ETC1)): Execution failed for task ':app:compileDebugJavaWithJavac'.
    UATHelper: 패키징 (Android (ETC1)): > Compilation failed; see the compiler error output for details.
    UATHelper: 패키징 (Android (ETC1)): * Try:
    UATHelper: 패키징 (Android (ETC1)): 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.
    UATHelper: 패키징 (Android (ETC1)): * Get more help at https://help.gradle.org
    UATHelper: 패키징 (Android (ETC1)): BUILD FAILED in 13s
    UATHelper: 패키징 (Android (ETC1)): 38 actionable tasks: 38 executed
    UATHelper: 패키징 (Android (ETC1)): ERROR: cmd.exe failed with args /c "C:\Users\seokj\Desktop\Saucewich\Intermediate\Android\APK\gradle\rungradle.bat" :app:assembleDebug
    UATHelper: 패키징 (Android (ETC1)): (see E:\UnrealEngine\Engine\Programs\AutomationTool\Saved\Logs\Log.txt for full exception trace)
    UATHelper: 패키징 (Android (ETC1)): AutomationTool exiting with ExitCode=1 (Error_Unknown)
    UATHelper: 패키징 (Android (ETC1)): BUILD FAILED
    PackagingResults: Error: Unknown Error
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