title: Gradle Project Sync Failing
body: <p>My Project Sync is failing with the below errors - </p>
  
  <p>Unable to resolve dependency for ':app@debug/compileClasspath': Could not download exoplayer-core.aar (com.google.android.exoplayer:exoplayer-core:r2.4.2)</p>
  
  <p>Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not download exoplayer-core.aar (com.google.android.exoplayer:exoplayer-core:r2.4.2)</p>
  
  <p>Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not download exoplayer-core.aar (com.google.android.exoplayer:exoplayer-core:r2.4.2)</p>
  
  <p>Unable to resolve dependency for ':app@release/compileClasspath': Could not download exoplayer-core.aar (com.google.android.exoplayer:exoplayer-core:r2.4.2)</p>
  
  <p>Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not download exoplayer-core.aar (com.google.android.exoplayer:exoplayer-core:r2.4.2)</p>
  
  <p>My Project build.grade looks like this - </p>
  
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
      repositories {
          jcenter()
          google()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.2.1'
          classpath 'com.google.gms:google-services:4.2.0'
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          google()
          maven {
              url "https://maven.google.com"
          }
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>And my App gradle file looks like - </p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      buildToolsVersion '28.0.3'
      defaultConfig {
          applicationId "com.android.application"
          minSdkVersion 15
          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'])
      androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
          exclude group: 'com.android.support', module: 'support-annotations'
      })
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support:design:28.0.0'
      implementation 'com.google.android.gms:play-services-ads:17.1.2'
      implementation 'com.google.android.gms:play-services-analytics:16.0.6'
      testImplementation 'junit:junit:4.12'
      implementation 'com.android.support:recyclerview-v7:28.0.0'
      implementation 'com.facebook.android:audience-network-sdk:5.1.0'
  }
  </code></pre>
  
  <p>Any help in this regard would be appreciated!!!
  How do I resolve this??</p>
  
  <p>I have tried Invalidate Caches/Restart option and also tried to rebuild the project but it didn't help..</p>