I’m going to use flutter and firebase together. And I’m going to finish setting firebase and try to run the app again, but I get the following error.

FAILURE: Build failed with an exception.

• Where:
  Build file ‘C:Users82102DocumentsFolderCodingFlutterkyunggi_lifeandroidappbuild.gradle’ line: 4

• What went wrong:
  Plugin [id: ‘com.google.gms.google-services’] was not found in any of the following sources:

• Gradle Core Plugins (plugin is not in ‘org.gradle’ namespace)
• Plugin Repositories (plugin dependency must include a version number for this source)

• 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 1s
Running Gradle task ‘assembleDebug’… 2,064ms
Error: Gradle task assembleDebug failed with exit code 1

I’ve already been trying to solve the problem for about three hours. I’ve seen solutions to similar problems, but I couldn’t apply them because I didn’t understand them well.

It seems certain to some extent that there is something wrong with the following 2 codes.

app/build.gradle

plugins {
    id "com.android.application"
    // START: FlutterFire Configuration
    id 'com.google.gms.google-services'
    // END: FlutterFire Configuration
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"
}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

android {
    namespace "com.example.kyunggi_life"
    compileSdk flutter.compileSdkVersion
    ndkVersion flutter.ndkVersion
    ndkVersion "26.1.10909125"

    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.kyunggi_life"
        // 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 flutter.minSdkVersion
        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
        }
    }
}

tasks.whenTaskAdded { task ->
    if (task.name == 'processDebugGoogleServices') {
        task.mustRunAfter 'mapDebugSourceSetPaths'
    }
}

flutter {
    source '../..'
}

dependencies {}

apply plugin: 'com.google.gms.google-services'

android/build.gradle

buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:7.0.4'
        classpath 'com.google.gms:google-services:4.3.10'
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}

I tried the following with an internet search.

Add
ndkVersion "26.1.10909125",
apply plugin: 'com.google.gms.google-services',

tasks.whenTaskAdded { task ->
    if (task.name == 'processDebugGoogleServices') {
        task.mustRunAfter 'mapDebugSourceSetPaths'
    }
}

at app/build.gradle

Check

buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:7.0.4'
        classpath 'com.google.gms:google-services:4.3.10'
    }
}
```,
in android/build.gradle