Сбой синхронизации Gradle Android studio 3.1.1

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привет парень
я устанавливаю android studio 3.1.1 и создаю новый проект ... но синхронизация проекта в любой момент терпела неудачу ! android studio gradle-это 4.4

этот Gradle в:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "ir.rahgoshafan.exampleapp"
        minSdkVersion 17
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    buildToolsVersion '27.0.3'

    buildscript {
        repositories {
            jcenter()
            google()
            maven { url 'http://repo1.maven.org/maven2' }
            maven { url 'http://jcenter.bintray.com' }
            maven { url "https://maven.google.com" }
            maven { url "https://jitpack.io" }
        }
        dependencies { classpath 'com.android.tools.build:gradle:3.1.0' }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:27.0.2'
    implementation 'com.android.support:design:27.0.2'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:support-vector-drawable:27.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

эта ошибка:

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:design:27.0.2.
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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:support-vector-drawable:27.0.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support.test:runner:1.0.1.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support.test.espresso:espresso-core:3.0.1.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:design:27.0.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:support-vector-drawable:27.0.2.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:design:27.0.2.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:support-vector-drawable:27.0.2.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve junit:junit:4.12.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support:design:27.0.2.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support:support-vector-drawable:27.0.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support:design:27.0.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support:support-vector-drawable:27.0.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve junit:junit:4.12.
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Что я уже пробовал:

я меняю совместимости приложений для

implementation 'com.android.support:appcompat-v7:27.0.3'

но подобные ошибки

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