minsdk 를 19로 설정했을 때 오류

Launching lib/main.dart on sdk gphone64 x86 64 in debug mode...

Running Gradle task 'assembleDebug'...

/Users/yoonjoochu/Documents/workspace/android/app/src/debug/AndroidManifest.xml Error:

uses-sdk:minSdkVersion 19 cannot be smaller than version 21 declared in library [:webview_flutter_android] /Users/yoonjoochu/Documents/workspace/build/webview_flutter_android/intermediates/merged_manifest/debug/AndroidManifest.xml as the library might be using APIs not available in 19

Suggestion: use a compatible library with a minSdk of at most 19,

or increase this project's minSdk version to at least 21,

or use tools:overrideLibrary="io.flutter.plugins.webviewflutter" to force usage (may lead to runtime failures)

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:processDebugMainManifest'.

> Manifest merger failed : uses-sdk:minSdkVersion 19 cannot be smaller than version 21 declared in library [:webview_flutter_android] /Users/yoonjoochu/Documents/workspace/build/webview_flutter_android/intermediates/merged_manifest/debug/AndroidManifest.xml as the library might be using APIs not available in 19

Suggestion: use a compatible library with a minSdk of at most 19,

or increase this project's minSdk version to at least 21,

or use tools:overrideLibrary="io.flutter.plugins.webviewflutter" to force usage (may lead to runtime failures)

* 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 4s

┌─ Flutter Fix ─────────────────────────────────────────────────────────────────────────────────┐

│ The plugin webview_flutter_android requires a higher Android SDK version. │

│ Fix this issue by adding the following to the file │

│ /Users/yoonjoochu/Documents/workspace/android/app/build.gradle: │

│ android { │

│ defaultConfig { │

│ minSdkVersion 21 │

│ } │

│ } │

│ │

│ Following this change, your app will not be available to users running Android SDKs below 21. │

│ Consider searching for a version of this plugin that supports these lower versions of the │

│ Android SDK instead. │

│ For more information, see: https://flutter.dev/to/review-gradle-config │

└───────────────────────────────────────────────────────────────────────────────────────────────┘

Error: Gradle task assembleDebug failed with exit code 1

분명 https://pub.dev/packages/webview_flutter 여기선 minsdk를 19로 설정하라고 하는데 왜 오류가 날까요??