React-native(android) AAPT: error: resource android:attr/dialogCornerRadius not found

Question

After running react-native run-android

I get this

JS server already running.
Building and installing the app on the device (cd android && gradlew.bat 
installDebug)...
C:\Users\Dd\.gradle\caches\transforms-1\files-1.1\appcompat-v7- 
28.0.0.aar\5f8d067ae17f4050cbc3c86889ab0be8\res\values-v28\values- 
v28.xml:9:5-12:13: AAPT: error: resource android:attr/dialogCornerRadius not 
found.

c:\react\diagnoseme\android\app\build\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml:11: AAPT: error: resource android:attr/dialogCornerRadius not found.

C:\Users\Dd\.gradle\caches\transforms-1\files-1.1\appcompat-v7-28.0.0.aar\5f8d067ae17f4050cbc3c86889ab0be8\res\values\values.xml:1304:5-69: AAPT: error: resource android:attr/fontVariationSettings not found.

C:\Users\Dd\.gradle\caches\transforms-1\files-1.1\appcompat-v7-28.0.0.aar\5f8d067ae17f4050cbc3c86889ab0be8\res\values\values.xml:1304:5-69: AAPT: error: resource android:attr/ttcIndex not found.

error: failed linking references.

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:processDebugResources'. Failed to process resources, see aapt output above for details.

* 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 22s 61 actionable tasks: 1 executed, 60 up-to-date Could not install the app on the device, read the error above for details. Make sure you have an Android emulator running or a device connected and have set up your Android development environment: https://facebook.github.io/react-native/docs/getting-started.html

Command failed: gradlew.bat installDebug

Error: Command failed: gradlew.bat installDebug
at checkExecSyncError (child_process.js:616:11)
at Object.execFileSync (child_process.js:634:13)
at runOnAllDevices (C:\react\diagnoseme\node_modules\react-native\local-cli\runAndroid\runAndroid.js:299:19)
at buildAndRun (C:\react\diagnoseme\node_modules\react-native\local-cli\runAndroid\runAndroid.js:135:12)
at isPackagerRunning.then.result (C:\react\diagnoseme\node_modules\react-native\local-cli\runAndroid\runAndroid.js:65:12)
at process._tickCallback (internal/process/next_tick.js:68:7)

Answer 1

This is because you're using appcompat-v7-28.0.0 and a mismatched compile SDK version (most likely 27). Either downgrade the libraries to match your SDK or upgrade your SDK to match your libraries.