title: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex in Android Studio 3.0
body: <p>This is my app level gradle file:</p>
  
  <pre><code>    apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 26
      buildToolsVersion '27.0.0'
      useLibrary 'org.apache.http.legacy'
      defaultConfig {
          multiDexEnabled true
          applicationId 'com.example.test'
          minSdkVersion 16
          targetSdkVersion 26
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
  
      compileOptions {
          sourceCompatibility JavaVersion.VERSION_1_8
          targetCompatibility JavaVersion.VERSION_1_8
      }
  
      productFlavors {
      }
      dexOptions {
          incremental true
      }
  }
  
  dependencies {
      compile 'com.google.android.gms:play-services:10.0.1'
      compile 'com.android.support:appcompat-v7:26.+'
      compile 'com.android.support:multidex:1.0.1'
      compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7'
      compile 'commons-io:commons-io:1.3.2'
      compile 'com.mcxiaoke.volley:library:1.0.19'
      compile 'com.facebook.stetho:stetho:1.5.0'
      compile 'com.github.PhilJay:MPAndroidChart:v3.0.2'
  }
  </code></pre>
  
  <p>The complete error I get when compiling the project is:</p>
  
  <p>Error:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.</p>
  
  <blockquote>
    <p>java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex</p>
  </blockquote>
  
  <p>The complete error is as follows:</p>
  
  <pre><code>    Executing tasks: [:app:assembleDebug]
  
  AGPBI: {"kind":"warning","text":"The `android.dexOptions.incremental` property is deprecated and it has no effect on the build process.","sources":[{},{}]}
  Configuration 'compile' in project ':app' is deprecated. Use 'implementation' instead.
  :app:buildInfoDebugLoader
  :app:preBuild UP-TO-DATE
  :app:preDebugBuild UP-TO-DATE
  :app:compileDebugAidl UP-TO-DATE
  :app:compileDebugRenderscript UP-TO-DATE
  :app:checkDebugManifest UP-TO-DATE
  :app:generateDebugBuildConfig UP-TO-DATE
  :app:prepareLintJar UP-TO-DATE
  :app:generateDebugResValues UP-TO-DATE
  :app:generateDebugResources UP-TO-DATE
  :app:mergeDebugResources UP-TO-DATE
  :app:createDebugCompatibleScreenManifests UP-TO-DATE
  :app:processDebugManifest UP-TO-DATE
  :app:splitsDiscoveryTaskDebug UP-TO-DATE
  :app:processDebugResources UP-TO-DATE
  :app:generateDebugSources
  :app:javaPreCompileDebug UP-TO-DATE
  :app:compileDebugJavaWithJavac UP-TO-DATE
  :app:mergeDebugShaders UP-TO-DATE
  :app:compileDebugShaders UP-TO-DATE
  :app:generateDebugAssets UP-TO-DATE
  :app:mergeDebugAssets UP-TO-DATE
  :app:packageInstantRunResourcesDebug UP-TO-DATE
  :app:checkManifestChangesDebug
  :app:extractTryWithResourcesSupportJarDebug UP-TO-DATE
  :app:transformClassesWithStackFramesFixerForDebug UP-TO-DATE
  :app:transformClassesWithDesugarForDebug UP-TO-DATE
  :app:transformClassesWithExtractJarsForDebug UP-TO-DATE
  :app:transformClassesWithInstantRunVerifierForDebug UP-TO-DATE
  :app:transformClassesWithDependencyCheckerForDebug UP-TO-DATE
  :app:compileDebugNdk NO-SOURCE
  :app:mergeDebugJniLibFolders UP-TO-DATE
  :app:transformNativeLibsWithMergeJniLibsForDebug UP-TO-DATE
  :app:processDebugJavaRes NO-SOURCE
  :app:transformResourcesWithMergeJavaResForDebug UP-TO-DATE
  :app:transformNativeLibsAndResourcesWithJavaResourcesVerifierForDebug UP-TO-DATE
  :app:transformClassesWithInstantRunForDebug UP-TO-DATE
  :app:transformClassesEnhancedWithInstantReloadDexForDebug UP-TO-DATE
  :app:incrementalDebugTasks UP-TO-DATE
  :app:preColdswapDebug
  :app:fastDeployDebugExtractor UP-TO-DATE
  :app:generateDebugInstantRunAppInfo UP-TO-DATE
  :app:transformClassesWithInstantRunSlicerForDebug UP-TO-DATE
  :app:transformClassesWithDexBuilderForDebug UP-TO-DATE
  :app:transformDexArchiveWithExternalLibsDexMergerForDebug FAILED
  :app:buildInfoGeneratorDebug
  
  FAILURE: Build failed with an exception.
  
  * What went wrong:
  Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
  &gt; java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
  
  * Get more help at https://help.gradle.org
  
  BUILD FAILED in 2s
  
  39 actionable tasks: 5 executed, 34 up-to-date
  </code></pre>