title: Failed to resolve: com.android.support:appcompat-v7:30.0.0
body: <p>I am beginner and getting this error in Android Studio :-</p>
  
  <blockquote>
    <p>Error:(26, 13) Failed to resolve: com.android.support:appcompat-v7:30.0.0
    Install Repository and sync project<br>Show in File<br>Show in Project Structure dialog</p>
  </blockquote>
  
  <p>And here is my gradle code :-</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 30
      buildToolsVersion "30.0.0"
      defaultConfig {
          applicationId "com.example.piyushbairagi.demoapp"
          minSdkVersion 15
          targetSdkVersion 30
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  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-v7:30.0.0'
      testCompile 'junit:junit:4.12'
  }
  </code></pre>
  
  <p>I am using Android Studio 2.2.1 version for learning purpose. Any help will really be appreciated.</p>