解决Firebase身份验证时出现“无法解决所有依赖性..”错误

Question

包括Firebase Auth库时出现此错误。 仅当我包含Firebase auth 11.8.0时才会出现此错误。 删除后，gradle将成功构建。 我使用的版本不兼容吗？

摇篮：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.company.myapp"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {

    def googleSupportVersion = '26.1.0'
    def googlePlayServicesVersion = '11.8.0'

    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "com.android.support:appcompat-v7:$googleSupportVersion"
    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'

    compile "com.google.firebase:firebase-core:$googlePlayServicesVersion"
    compile "com.google.firebase:firebase-auth:$googlePlayServicesVersion"
    compile "com.google.firebase:firebase-messaging:$googlePlayServicesVersion"
}
apply plugin: 'com.google.gms.google-services'

和：

buildscript {
    repositories {
        jcenter()
        mavenCentral()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath 'com.google.gms:google-services:3.2.0'
    }
}
allprojects {
    repositories {
        jcenter()
        google()
        maven { url "https://jitpack.io" }
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}

错误：

Error:Could not resolve all dependencies for configuration ':app:debugRuntimeClasspath'.
Could not determine artifacts for com.google.firebase:firebase-auth:11.8.0
Could not get resource 'https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-auth/11.8.0/firebase-auth-11.8.0.aar'.
Could not HEAD 'https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-auth/11.8.0/firebase-auth-11.8.0.aar'.
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
unable to find valid certification path to requested target