title: Error:(30, 0) Could not find method compile() for arguments
body: <p>I get this error. I'm pretty confused because i check everything in sdk manager and it's all updated (i think so).</p>
  
  <blockquote>
    <p>Error:(30, 0) Could not find method compile() for arguments
    [com.android.support:appcompat-v7:+] on object of type
    org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.</p>
    
    <p>Please install the Android Support Repository from the Android SDK
    Manager. Open Android SDK Manager</p>
  </blockquote>
  
  <p>Is there something wrong with my code in build.grandle:</p>
  
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
  
      repositories {
          google()
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.0.0'
  
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          google()
          jcenter()
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  
  dependencies {
      compile 'com.android.support:appcompat-v7:+'
  }
  </code></pre>
  
  <p>or is something missing...?</p>