Gradle 同步失败：预期配置 ':backend:appengineSdk' 仅包含一个文件，但是，它不包含任何文件

Question

我按照教程 here 使用 Firebase 和 Google App Engine 设置我的 Android 应用。一切正常，直到我添加了 Google App Engine 模块，然后在 gradle build 期间出现以下错误：

Gradle sync failed: Expected configuration ':backend:appengineSdk' to contain exactly one file, however, it contains no files.

有人有什么想法吗？没有此类错误的参考，我迷路了！

我的项目毕业：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

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

我的应用分级：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.joelmin.sharemon"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE-FIREBASE.txt'
        exclude 'META-INF/NOTICE'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.firebase:firebase-client-android:2.5.2'
}

应用引擎分级：

// If you would like more information on the gradle-appengine-plugin please refer to the github page
// https://github.com/GoogleCloudPlatform/gradle-appengine-plugin

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.google.appengine:gradle-appengine-plugin:1.9.28'
    }
}

repositories {
    jcenter();
}

apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'appengine'

sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7

dependencies {
}

appengine {
  downloadSdk = true
  appcfg {
    oauth2 = true
  }
}

Answer 1

所以我通过删除现有的应用程序引擎模块并重新创建一个具有不同名称的新模块来解决此问题，然后一切正常...奇怪...