试过各种解决方案但仍然出现此错误：找不到com.google.android.gms：play-services-gcm：8.4.0

Question

这是我得到的错误。我尝试了一切，我使用的是android studio 1.3.1版本：

Error:Could not find com.google.android.gms:play-services-gcm:8.4.0.
Required by:
    StockHawk-master:app:unspecified
<a href="searchInBuildFiles">Search in build.gradle files</a>

当我点击上面的链接时，它会找到服务，但是gradle会一次又一次地显示错误。

这是build.gradle代码：

   apply plugin: 'com.android.application'

    apply plugin: 'android-apt'

    android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
    applicationId "com.example..stockhawk"
    minSdkVersion 15
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
    }
    buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-   rules.pro'
    }
  }
}

      repositories {
      maven { url "https://jitpack.io" }
      }

      dependencies {
       compile 'com.google.android.gms:play-services-gcm:8.4.0'
       compile 'com.squareup.okhttp:okhttp:2.5.0'
       apt 'net.simonvt.schematic:schematic-compiler:0.6.3'
       compile 'net.simonvt.schematic:schematic:0.6.3'
       compile 'com.melnykov:floatingactionbutton:1.2.0'
       compile 'com.android.support:design:23.1.1'
       compile 'com.lsjwzh:materialloadingprogressbar:0.5.6-RELEASE'
       compile 'com.github.blackfizz:eazegraph:1.2.2@aar'
       compile 'com.nineoldandroids:library:2.4.0'
       compile('com.github.afollestad.material-dialogs:core:0.8.5.7@aar') {
       transitive = true
       }
      }
      apply plugin: 'com.google.gms.google-services'