title: Android Studio build error - Multiple dex files define Landroid/support/v4/
body: <p>I am unable to build my project in Android Studio.  I get the following error:</p>
  
  <pre><code>Error:Android Dex: [RaditazAndroid] Unable to execute DX
  Error:Android Dex: [RaditazAndroid] com.android.dx.util.DexException: Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat$AccessibilityServiceInfoVersionImpl;
  Error:Android Dex: [RaditazAndroid] at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:592)
  Error:Android Dex: [RaditazAndroid] at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:550)
  Error:Android Dex: [RaditazAndroid] at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:531)
  Error:Android Dex: [RaditazAndroid] at com.android.dx.merge.DexMerger.mergeDexBuffers(DexMerger.java:168)
  Error:Android Dex: [RaditazAndroid] at com.android.dx.merge.DexMerger.merge(DexMerger.java:186)
  Error:Android Dex: [RaditazAndroid] at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:300)
  Error:Android Dex: [RaditazAndroid] at com.android.dx.command.dexer.Main.run(Main.java:232)
  Error:Android Dex: [RaditazAndroid] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  Error:Android Dex: [RaditazAndroid] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  Error:Android Dex: [RaditazAndroid] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  Error:Android Dex: [RaditazAndroid] at java.lang.reflect.Method.invoke(Method.java:597)
  Error:Android Dex: [RaditazAndroid] at org.jetbrains.android.compiler.tools.AndroidDxRunner.runDex(AndroidDxRunner.java:147)
  Error:Android Dex: [RaditazAndroid] at org.jetbrains.android.compiler.tools.AndroidDxRunner.main(AndroidDxRunner.java:276)
  Error:Android Dex: [RaditazAndroid] at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:121)
  </code></pre>
  
  <p>However, this error means nothing to me.  It does not provide clues as to where I should begin fixing my project.  Has anybody encountered something similar?</p>