FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeReleaseResources'.
> Multiple task action failures occurred:
   > A failure occurred while executing com.android.build.gradle.internal.res.Aapt2CompileRunnable
      > Android resource compilation failed
        ERROR:/Users/user/app/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: AAPT: error: file failed to compile.

   > A failure occurred while executing com.android.build.gradle.internal.res.Aapt2CompileRunnable
      > Android resource compilation failed
        ERROR:/Users/user/app/android/app/src/main/res/mipmap-mdpi/ic_launcher.png: AAPT: error: file failed to compile.

   > A failure occurred while executing com.android.build.gradle.internal.res.Aapt2CompileRunnable
      > Android resource compilation failed
        ERROR:/Users/user/app/android/app/src/main/res/mipmap-hdpi/ic_launcher.png: AAPT: error: file failed to compile.

   > A failure occurred while executing com.android.build.gradle.internal.res.Aapt2CompileRunnable
      > Android resource compilation failed
        ERROR:/Users/user/app/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png: AAPT: error: file failed to compile.

   > A failure occurred while executing com.android.build.gradle.internal.res.Aapt2CompileRunnable
      > Android resource compilation failed
        ERROR:/Users/user/app/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png: AAPT: error: file failed to compile.


* Try:
> 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.

* Get more help at https://help.gradle.org

BUILD FAILED in 9s
Running Gradle task 'assembleRelease'...                           10.2s
Gradle task assembleRelease failed with exit code 1

앱 아이콘을 변경하고 이런 오류가 발생했습니다.

이미지 파일에도 문제가 없는데 말이죠...

앱 아이콘은 반드시 png 파일로 되어있어야 합니다.

그런데 이름만 png이지 실제 확장자는 JPEG로 되어있더군요

jpeg -> png 로 변환하고 다시 build하니 잘 되었습니다.