title: AppCompatActivity Gradle Error
body: <p>I tried to modify an app by changing <code>ActionBarActivity</code> in <code>AppCompatActivity</code>.<br>
  I also changed the <code>build.gradle</code> file, attach the modified version.</p>
  
  <p>Now when I try to run the program I get an error message:</p>
  
  <p><a href="https://i.stack.imgur.com/VqT8x.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VqT8x.png" alt="enter image description here"></a></p>
  
  <p>How do I run the program?</p>
  
  <p>********** build.gradle *********</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
  compileSdkVersion 21
  buildToolsVersion "20.0.0"
  
  defaultConfig {
      applicationId "it.giocoparole.trovanagramma"
      minSdkVersion 10
      targetSdkVersion 23
      versionCode 3
      versionName "0.9.2"
  }
  
  signingConfigs {
      release {
          storeFile file("C:\\AndroidStudioKeystore\\TrovAnagramma.jks")
          storePassword "xxxxx"
          keyAlias "Alias_TrovAnagramma"
          keyPassword "xxxxx"
      }
  }
  
  buildTypes {
      release {
          signingConfig signingConfigs.release
  
  
          minifyEnabled true
          zipAlignEnabled true
          proguardFiles getDefaultProguardFile('proguard-android.txt'),  'proguard-rules.pro'
      }
      debug {
          zipAlignEnabled true
          minifyEnabled false
      }
  }
  }
  
  dependencies {
  compile fileTree(include: ['*.jar'], dir: 'libs')
  
  compile 'com.google.android.gms:play-services:6.+'
  
  compile 'com.android.support:appcompat-v7:23.1.1'
  compile 'com.android.support:support-v4:23.1.1'
  }
  </code></pre>