Flutter problems: "Could not resolve all artifacts for configuration ':classpath' "

Question

I am trying to run a flutter app I am writing on my device but when I try to run, I never get past the "assembleDebug" stage and get this message in the terminal:

Launching lib\main.dart on SM N950U in debug mode... Running Gradle task 'assembleDebug'...  FAILURE: Build failed with an exception.  * What went wrong: A problem occurred configuring root project 'android'. > Could not resolve all artifacts for configuration ':classpath'.    > Could not find com.android.tools.build:gradle:5.6.2.      Searched in the following locations:        - https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/5.6.2/gradle-5.6.2.pom        - https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/5.6.2/gradle-5.6.2.jar        - https://jcenter.bintray.com/com/android/tools/build/gradle/5.6.2/gradle-5.6.2.pom        - https://jcenter.bintray.com/com/android/tools/build/gradle/5.6.2/gradle-5.6.2.jar      Required by:          project :  * 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 14s Finished with error: Gradle task assembleDebug failed with exit code 1 

I have recently updated to gradle 6.0.1 (I assume I did that correctly but I am very new to all this) and there are no issues with flutter doctor.

Here is my project level build.gradle:

buildscript {     ext.kotlin_version = '1.3.50'     repositories {         google()         jcenter()     }      dependencies {         classpath 'com.android.tools.build:gradle:5.6.2'         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"         classpath 'com.google.gms:google-services:4.3.3'     } }  allprojects {     repositories {         google()         jcenter()     } }  rootProject.buildDir = '../build' subprojects {     project.buildDir = "${rootProject.buildDir}/${project.name}" } subprojects {     project.evaluationDependsOn(':app') }  task clean(type: Delete) {     delete rootProject.buildDir } 

Here is the app level 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: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"  android {     compileSdkVersion 28      sourceSets {         main.java.srcDirs += 'src/main/kotlin'     }      lintOptions {         disable 'InvalidPackage'     }      defaultConfig {         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).         applicationId "com.example.skypeclone1"         minSdkVersion 16         targetSdkVersion 28         versionCode flutterVersionCode.toInteger()         versionName flutterVersionName         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"         multiDexEnabled true     }      buildTypes {         release {             // TODO: Add your own signing config for the release build.             // Signing with the debug keys for now, so `flutter run --release` works.             signingConfig signingConfigs.debug         }     } }  flutter {     source '../..' }  dependencies {     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"     testImplementation 'junit:junit:4.12'     androidTestImplementation 'com.android.support.test:runner:1.0.2'     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' } apply plugin: 'com.google.gms.google-services' 

Here are my Gradle wrapper properties in case they are also important.

#Fri Jun 23 08:50:38 CEST 2017 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip 

gradle.properties

org.gradle.jvmargs=-Xmx1536M android.useAndroidX=true android.enableJetifier=true android.enableR8=true 

Answer 1

You're trying to use actual Gradle. For Android development, there's Android Gradle which is currently on version 3.5.3 which came out this month. Read this article: https://developer.android.com/studio/releases/gradle-plugin#3-5-0.

EDIT: To use the latest version of Android Gradle (3.5.3), you need Gradle versions between 5.4.1-5.6.4 which you can configure in the gradle-wrapper.properties file. I guess Android Gradle doesn't yet support Gradle 6.