title: Android transform classes with dex for debug
body: <p>I run Firebase database and I have an error. I have apply plugin: 'com.google.gms.google-services', but I get an error. I did not get an error when I first ran the program but now I get an error</p>
  
  <p>My error:</p>
  
  <pre><code>Error:Execution failed for task ':app:transformClassesWithDexForDebug'.
  &gt; com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/common/api/zza;
  </code></pre>
  
  <p>build.gradle</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
   android {
  compileSdkVersion 26
  buildToolsVersion "26.0.1"
  defaultConfig {
      applicationId "com.yavuzoktay.foodapp"
      minSdkVersion 19
      targetSdkVersion 26
      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'
  })
  
  //Add Library
  
  
  compile 'com.android.support:appcompat-v7:26.+'
  compile 'com.android.support.constraint:constraint-layout:1.0.2'
  compile 'com.google.firebase:firebase-core:9.0.0'
  compile 'com.google.firebase:firebase-database:9.0.0'
  compile 'info.hoang8f:fbutton:1.0.5'
  compile 'com.rengwuxian.materialedittext:library:2.1.4'
  compile 'com.android.support:cardview-v7:26.+'
  compile 'com.android.support:recyclerview-v7:26.+'
  compile 'com.squareup.picasso:picasso:2.5.2'
  compile 'com.firebaseui:firebase-ui-database:1.2.0'
  compile 'com.android.support:design:26.+'
  testCompile 'junit:junit:4.12'
  
  
  
     }
     apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>Your advice important for me </p>
  
  <p>Thank you very much !</p>