Android studio "AAPT2 error"

When you compile a project sometimes, you may run into "AAPT2 error": Caused by: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details . Search for this error message on google, there are tons of possible resolutions for this, you'll never know what if the root cause of your current issue.
The best practice I find: ./gradlew assembleDebug .
In my case, the terminal shows exactly the erroneous line:
C:\xxx\AndroidManifest.xml:13: error: attribute 'android:roundIcon' not found. error: failed processing manifest.
After I remove that line android:roundIcon , still there are errors, so I run ./gradlew assembleDebug again.
C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:13: error: attribute 'android:endX' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:13: error: attribute 'android:endY' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:13: error: attribute 'android:startX' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:13: error: attribute 'android:startY' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:19: error: attribute 'android:offset' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:22: error: attribute 'android:offset' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:7: error: attribute 'android:fillType' not found. C:\xxx\app\src\main\res\drawable-v24\ic_launcher_foreground.xml:28: error: attribute 'android:fillType' not found.
So again, remove that incorrect res folders. Problem solved!
The root cause of this issue: At first the compileSdkVersion is high (compileSdkVersion >= 26), then I decrease it to 23 , so some new features which are introduced in API level 26 are not available in API level 23.
Anyway, Android Studio is not friendly enough to point out the exact errors.