* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

에러가 떠서 다른 답변을 참조하니 강사님께서 'minSdkVersion 19' 변경하라고 해서 변경해서 적용했더니 팝업창이 뜨면서 에러가 떴습니다.

build.gradle 화면을 아래와 같이

def localProperties = new Properties()

def localPropertiesFile = rootProject.file('local.properties')

if (localPropertiesFile.exists()) {

    localPropertiesFile.withReader('UTF-8') { reader ->

        localProperties.load(reader)

    }

}

def flutterRoot = localProperties.getProperty('flutter.sdk')

if (flutterRoot == null) {

    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")

// GradleException 의 G 의 밑줄이 그어져 있습니다.

}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')

if (flutterVersionCode == null) {

    flutterVersionCode = '1'

}

def flutterVersionName = localProperties.getProperty('flutter.versionName')

if (flutterVersionName == null) {

    flutterVersionName = '1.0'

}

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {

    compileSdkVersion flutter.compileSdkVersion

    ndkVersion flutter.ndkVersion

    compileOptions {

        sourceCompatibility JavaVersion.VERSION_1_8

        targetCompatibility JavaVersion.VERSION_1_8

    }

    kotlinOptions {

        jvmTarget = '1.8'

    }

    sourceSets {

        main.java.srcDirs += 'src/main/kotlin'

    }

    defaultConfig {

        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).

        applicationId "com.example.mymemo_admob"

        // You can update the following values to match your application needs.

        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.

        minSdkVersion 19

        targetSdkVersion flutter.targetSdkVersion

        versionCode flutterVersionCode.toInteger()

        versionName flutterVersionName

    }

    buildTypes {

        release {

            // TODO: Add your own signing config for the release build.

            // Signing with the debug keys for now, so `flutter run --release` works.

            signingConfig signingConfigs.debug

        }

    }

}

flutter {

    source '../..'

}

dependencies {

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

}