title: Cannot import com.google.android.gms:play-services-ads:17.1.1
body: <pre><code>apply plugin: 'com.android.application'
     android {
     compileSdkVersion 28
  
     defaultConfig {
        applicationId "com.kaiboon0216gmail.homeownerstarterkit"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner 
        "android.support.test.runner.AndroidJUnitRunner"
      } 
      buildTypes {
         release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
      }
  }
  
  
  dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
     implementation 'com.android.support:cardview-v7:28.0.0'
     implementation 'com.google.android.gms:play-services-ads:17.1.1'
  }
  </code></pre>
  
  <p>These are my codes.I'm using Admob to display the ads in my app.When I add this code:"<strong>'com.google.android.gms:play-services-ads:17.1.1'"</strong> and sync , my apps crash.</p>
  
  <p>After that I go to Admob official website and found that this version is for <strong>'com.android.support:appcompat-v7:26.1.0'</strong> version. But when I change the <strong>compileSdkVersion</strong> to 26, my apps still crash....</p>
  
  <p>I have test the code without this code:"<strong>'com.google.android.gms:play-services-ads:17.1.1'"</strong> and it can run.Im sure that this code is the problem but i have no idea how to correct it.</p>
  
  <p>Could anyone help to solve my problem?
  Thank you.</p>