Gradle 构建工具找不到 play-services-tasks.aar?为什么?

今天突然，当我尝试在 Android Studio 中运行我的应用程序时出现错误.

Today suddenly, I got an error when I tried to run my app in Android studio.

就是:

Error: Could not find play-services-tasks.aar (com.google.android.gms:play-services-tasks:15.0.1).
Searched in the following locations:
    https://jcenter.bintray.com/com/google/android/gms/play-services-tasks/15.0.1/play-services-tasks-15.0.1.aar

我没有更改 gradle 文件中的任何内容，但它突然出现.几分钟前，我之前的构建成功执行.

I didn't change anything in the gradle file but it appeared suddenly. My previous build executed successfully some minutes ago.

为什么它找不到 play-services-tasks.aar 这是 com.google.android.gms:play-services-tasks:15.0.1 的一部分b>

Why it can't find play-services-tasks.aar which is the part of com.google.android.gms:play-services-tasks:15.0.1

采取的步骤:

我检查了我是否在 gradle 文件中包含了所有存储库，到目前为止一切都是正确的.

I checked whether I included all repositories in the gradle files and all are correct so far.

为什么会突然出现这个错误?

Why does this error occur all of a sudden?

我也复制了这个链接https://jcenter.bintray.com/com/google/android/gms/play-services-tasks/15.0.1/play-services-tasks-15.0.1.aar 进入浏览器但它工作正常，也就是说，我得到了文件下载"对话框.

I also copied this link https://jcenter.bintray.com/com/google/android/gms/play-services-tasks/15.0.1/play-services-tasks-15.0.1.aar into the browser but it's working fine, that is, I got "File Download" dialog.

我的 Gradle 文件

• 应用级别

• App level

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"
    defaultConfig {
        applicationId "mekanic24assistantapplication.heba.mekanic24.com.mekanic24assistantapplication"
        minSdkVersion 14
        targetSdkVersion 26
        versionCode 13
        versionName "2.1"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }


    dexOptions {
        incremental true
        javaMaxHeapSize "4g"
    }

//    err Android Gradle Duplicate files copied in APK META-INF/license.txt

    configurations.all {

        resolutionStrategy {
            force 'com.android.support:support-v4:26+'
            force 'com.android.support:support-annotations:26+'


        }

    }


    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }

}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    //   compile 'com.android.support:appcompat-v7:26.3.1'
    compile 'com.android.support:appcompat-v7:26+'
    compile 'com.android.support:design:26+'
    compile 'com.android.support:recyclerview-v7:26+'
    compile 'com.android.support:cardview-v7:26+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    androidTestCompile 'com.android.support:support-annotations:26+'
    testCompile 'junit:junit:4.12'
    //   compile 'com.android.support:appcompat-v7:26.3.1'
    compile 'com.github.markushi:circlebutton:1.1'
    //  compile 'com.android.support:design:26.3.1'
    compile 'com.android.volley:volley:1.0.0'
    compile 'com.google.android.gms:play-services-base:15.0.1'
    compile 'com.android.support:multidex:1.0.1'
    compile 'com.firebase:firebase-client-android:2.5.2'
    compile 'com.google.firebase:firebase-core:15.0.2'
    compile 'com.google.firebase:firebase-messaging:15.0.2'
    compile 'com.google.firebase:firebase-database:15.0.0'
    compile 'com.wang.avi:library:2.1.3'
    compile 'de.hdodenhof:circleimageview:2.2.0'
    compile 'android.lib.recaptcha:reCAPTCHA:2.0.0'
    compile 'com.google.android.gms:play-services-safetynet:15.0.1'
    compile 'com.google.android.gms:play-services-maps:15.0.1'
    compile 'com.google.android.gms:play-services-places:15.0.1'
    compile 'com.google.android.gms:play-services-location:15.0.1'

    compile 'com.squareup.picasso:picasso:2.5.2'
    testCompile 'junit:junit:4.12'
    compile 'com.anjlab.android.iab.v3:library:1.0.38'
    compile files('libs/mail.jar')
    compile files('libs/additionnal.jar')
    compile files('libs/activation.jar')
    compile 'com.jakewharton:butterknife:8.8.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
    compile 'com.yarolegovich:lovely-dialog:1.1.0'
    compile 'com.mobsandgeeks:android-saripaar:2.0.3'
    compile 'com.github.stfalcon:smsverifycatcher:0.3.1'
    compile 'ch.acra:acra:4.9.0'
    //TODO:  Apache 2.0 license https://github.com/ACRA/acra
    compile 'com.google.android.gms:play-services-ads:15.0.1'
    compile 'com.github.luongvo:GmailBackground:2.0.2'

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

buildscript {
repositories {
    jcenter()
    maven { url 'https://maven.google.com' }
    maven {
        url "https://dl.bintray.com/android/android-tools"
    }

    maven { url "https://jitpack.io" }
    google()

}
dependencies {
    classpath 'com.android.tools.build:gradle:2.3.2'

    classpath 'com.google.gms:google-services:3.2.0'
}
}

allprojects {
repositories {
    jcenter()
    maven { url 'https://maven.google.com' }
    maven {
        url "https://dl.bintray.com/android/android-tools"
    }

    maven { url "https://jitpack.io" }
    google()

}
}

task clean(type: Delete) {
delete rootProject.buildDir
}