FLUTTER: Execution failed for task ':flutter_plugin_android_lifecycle:generateDebugRFile' - flutter

Question

I was trying to integrate google maps in my app. However, since I updated the minSdkVersion to 21. I am facing this problem.
My build.gradle
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.")
}
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: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
android {
compileSdkVersion flutter.compileSdkVersion
ndkVersion flutter.ndkVersion
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "sarnyp.com.sarnyp"
// You can update the following values to match your application needs.
// For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
minSdkVersion 21
targetSdkVersion flutter.targetSdkVersion
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
}
buildTypes {
release {
// TODO: Add your own signing config for the release build.
// Signing with the debug keys for now, so `flutter run --release` works.
signingConfig signingConfigs.debug
}
}
}
flutter {
source '../..'
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
The error I get on loop.
Launching lib/main.dart on Android SDK built for arm64 in debug mode...
Running Gradle task 'assembleDebug'...
Warning: Failed to parse host user
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':flutter_plugin_android_lifecycle:generateDebugRFile'.
> Could not resolve all files for configuration ':flutter_plugin_android_lifecycle:debugCompileClasspath'.
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.5.30.
Required by:
project :flutter_plugin_android_lifecycle > org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30
Please help!
I tried to change http proxy settings, but it did no good. I even ran flutter clean, uninstalled and reinstalled both flutter and android studio, but it had no effects.