uses-sdk:minSdkVersion 16 cannot be smaller than version 19 declared [Flutter v2.8.1]

android->app->build.gradle file

defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.flutter_calismalari"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

make the minSdkVersion from 16 to 21

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