title: Error:Execution failed for task ':app:processDebugGoogleServices'. Update version of com.google.android.gms to 10.2.6
body: <p>I'm trying to implement Google Sign-In through Firebase into my Android app and the following message keeps appearing after my Gradle sync:</p>
  
  <blockquote>
    <p>Error:Execution failed for task ':app:processDebugGoogleServices'.
    Please fix the version conflict either by updating the version of the google-services plugin (information about the latest version is available at <a href="https://bintray.com/android/android-tools/com.google.gms.google-services/" rel="nofollow noreferrer">https://bintray.com/android/android-tools/com.google.gms.google-services/</a>) or updating the version of com.google.android.gms to 10.2.6.</p>
  </blockquote>
  
  <p>How can I fix this error?</p>
  
  <p>Here's my Gradle file:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 25
      buildToolsVersion "25.0.2"
      defaultConfig {
          applicationId "com.sjf.lgcats"
          minSdkVersion 15
          targetSdkVersion 25
          versionCode 2
          versionName "1.0.1"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
          vectorDrawables.useSupportLibrary = true
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
      sourceSets { main { assets.srcDirs = ['src/main/assets', 'src/main/assets/2'] } }
  }
  
  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-v7:25.3.1'
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
      compile 'com.android.support:design:25.3.1'
      compile 'com.android.support:support-vector-drawable:25.3.1'
      compile 'com.android.support:support-v4:25.3.1'
      compile 'com.google.firebase:firebase-auth:10.2.6'
      compile 'com.google.firebase:firebase-messaging:10.2.6'
      compile 'com.google.firebase:firebase-auth:11.0.0'
      compile 'com.google.android.gms:play-services-auth:11.0.0'
      compile 'commons-io:commons-io:2.0.1'
      testCompile 'junit:junit:4.12'
  }
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>