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how do i fix flutter error in build.gradle file android studio

`plugins {
    id 'com.android.application'
}    




android {


    compileNdk flutter.compileNdkVersion

    compileOptions{
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions{
        jvmTarget = "1.8"
    }
    sourceSets{
        main.java.srcDir +='src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.example.block7"

        minSdk localProperties . getProperty('flutter.minSdkVersion').toInteger()

        targetSdk localProperties . getProperty('flutter.targetSdkVersion').toInteger()

        versionCode flutterVersionCode . toInteger()

        versionName flutterVersionCode . toInteger()

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        value "test"
        targetSdkVersion 30
        minSdkVersion 30
    }`