title: Gradle error while importing library
body: <p>I have many problem with import module in android studio.</p>
  
  <p>The first time when i tried to import module , gradle said : <code>target sdk not found.</code></p>
  
  <p>Then i installed target sdk , gradle said <code>target platform-tools not found</code>. And these errors not solving with installing sdk and platform-tools.</p>
  
  <p>I have these errors while try to import sherlockactionbar and many else library.</p>
  
  <pre><code>gradle version : 2.8
  </code></pre>
  
  <p>Please tell me how to solve this problem.</p>
  
  <p>build.gradle of my app:
  <div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 20
      buildToolsVersion "20.0.0"
  
      defaultConfig {
          applicationId "a.x.e.h.myapplication"
          minSdkVersion 19
          targetSdkVersion 20
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile project(':mylibrary')
      compile project(':actionbarsherlock')
      compile project(':actionbarsherlock-fest')
      compile project(':actionbarsherlock-i18n')
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>error when i added dependency module:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>Error:failed to find Build Tools revision 17.0.0
  &lt;a href="install.build.tools"&gt;Install Build Tools 17.0.0 and sync project&lt;/a&gt;</code></pre>
  </div>
  </div>
  </p>