问NullPointerException(无错误消息)

EN

我知道我的这个问题已经被多次询问过了，我确实遵循了大部分答案，但没有一个帮助我。所以这是我的问题，每当我同步我的项目时，它总是失败。以下是Gradle控制台：

执行任务：[：app：generateDebugSources，：app：generateDebugAndroidTestSources，：app：mockableAndroidJar，：app：prepareDebugUnitTestDependencies] Configuration on demand is an incubating feature. Incremental java compilation is an incubating feature. :app:preBuild UP-TO-DATE :app:preDebugBuild UP-TO-DATE :app:checkDebugManifest :app:preReleaseBuild UP-TO-DATE :app:prepareComAndroidSupportAnimatedVectorDrawable2420Library UP-TO-DATE :app:prepareComAndroidSupportAppcompatV72420Library UP-TO-DATE :app:prepareComAndroidSupportDesign2420Library UP-TO-DATE :app:prepareComAndroidSupportMediarouterV72300Library UP-TO-DATE :app:prepareComAndroidSupportRecyclerviewV72420Library UP-TO-DATE :app:prepareComAndroidSupportSupportCompat2420Library UP-TO-DATE :app:prepareComAndroidSupportSupportCoreUi2420Library UP-TO-DATE :app:prepareComAndroidSupportSupportCoreUtils2420Library UP-TO-DATE :app:prepareComAndroidSupportSupportFragment2420Library UP-TO-DATE :app:prepareComAndroidSupportSupportMediaCompat2420Library UP-TO-DATE :app:prepareComAndroidSupportSupportV42420Library UP-TO-DATE :app:prepareComAndroidSupportSupportVectorDrawable2420Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServices940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAds940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAdsLite940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAnalytics940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAnalyticsImpl940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAppindexing940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAppinvite940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAuth940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesAuthBase940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesBase940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesBasement940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesCast940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesCastFramework940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesClearcut940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesContextmanager940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesDrive940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesFitness940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesGames940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesGass940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesGcm940Library UP-TO-DATE :app:prepareComGoogleAndroidGmsPlayServicesIdentity940Library FAILURE: Build failed with an exception.

• 出了什么问题：java.lang.NullPointerException（无错误消息）
• 尝试：使用--stacktrace选项运行以获取堆栈跟踪。使用--info或--debug选项运行以获取更多日志输出。

构建失败 总时间：7.518秒

这些是我的

dependencies {
   compile fileTree(dir: 'libs', include: ['*.jar'])

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.0'
    compile 'com.android.support:design:24.2.0'
    compile 'com.google.android.gms:play-services:9.4.0'
    testCompile 'junit:junit:4.12'
    compile 'com.google.android.gms:play-services-location:9.4.0'
    compile 'com.google.android.gms:play-services-appindexing:9.4.0'
    compile 'com.google.firebase:firebase-messaging:9.2.0'
    compile 'com.google.firebase:firebase-database:9.0.2'
    compile 'com.firebase:firebase-client-android:2.4.0'
    compile 'com.google.firebase:firebase-core:9.4.0'
}

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

如何解决这个问题？