Launching lib\main.dart on Nokia X6 in debug mode...

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> Android resource linking failed
  Output:  E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:7: error: resource android:attr/dialogCornerRadius not found.
  E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:11: error: resource android:attr/dialogCornerRadius not found.
  E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:959: error: resource android:attr/fontVariationSettings not found.
  E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:960: error: resource android:attr/ttcIndex not found.
  error: failed linking references.

  Command: C:\Users\hupo3\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\c1441429ce2aae0e0bed3ad48db2b49e\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
          C:\Users\hupo3\AppData\Local\Android\sdk\platforms\android-27\android.jar\
          --manifest\
          E:\Flutter Projects\intro_to_flutter\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
          -o\
          E:\Flutter Projects\intro_to_flutter\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
          -R\
          @E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          E:\Flutter Projects\intro_to_flutter\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
          --custom-package\
          com.xiaobing.introtoflutter\
          -0\
          apk\
          --output-text-symbols\
          E:\Flutter Projects\intro_to_flutter\build\app\intermediates\symbols\debug\R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0
  Output:  C:\Users\hupo3\.gradle\caches\transforms-1\files-1.1\appcompat-v7-28.0.0.aar\12aaee80bab0fcaef8511d3958ba785b\res\values-v28\values-v28.xml:9:5-12:13: AAPT: error: resource android:attr/dialogCornerRadius not found.

  E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:11: AAPT: error: resource android:attr/dialogCornerRadius not found.

  C:\Users\hupo3\.gradle\caches\transforms-1\files-1.1\support-compat-28.0.0.aar\b1fc0e0ff1348f4d278539eb80ede9d3\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/fontVariationSettings not found.

  C:\Users\hupo3\.gradle\caches\transforms-1\files-1.1\support-compat-28.0.0.aar\b1fc0e0ff1348f4d278539eb80ede9d3\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/ttcIndex not found.

  error: failed linking references.
  Command: C:\Users\hupo3\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\c1441429ce2aae0e0bed3ad48db2b49e\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
          C:\Users\hupo3\AppData\Local\Android\sdk\platforms\android-27\android.jar\
          --manifest\
          E:\Flutter Projects\intro_to_flutter\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
          -o\
          E:\Flutter Projects\intro_to_flutter\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
          -R\
          @E:\Flutter Projects\intro_to_flutter\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          E:\Flutter Projects\intro_to_flutter\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
          --custom-package\
          com.xiaobing.introtoflutter\
          -0\
          apk\
          --output-text-symbols\
          E:\Flutter Projects\intro_to_flutter\build\app\intermediates\symbols\debug\R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0

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

BUILD FAILED in 18s
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

Open android\app\build.gradle

Modify compileSdkVersion and targetSdkVersion