title: Android Build fail - java.lang.IllegalArgumentException: already added: Lcom/google/api/client/escape/CharEscapers;
body: <p>I just prepare small update for my android app, but I get this strange bug when I try to build my app (in debug mode). It will be great if someone smarter could look at this to figure out what might been wrong. I was cleaning/rebuild/fix project properties, but with no results. I have no clues what is going on :(. Maybe something similar happen to anyone here?
  If this can help I use following libraries: adMob(4.1.1), openfeint and libgdx.</p>
  
  <p>here is building log:</p>
  
  <pre><code>UNEXPECTED TOP-LEVEL EXCEPTION:
  java.lang.IllegalArgumentException: already added: Lcom/google/api/client/escape/CharEscapers;
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.dex.file.DexFile.add(DexFile.java:163)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main.processClass(Main.java:486)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main.processFileBytes(Main.java:455)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main.access$400(Main.java:67)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:394)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:131)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:109)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main.processOne(Main.java:418)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main.processAllFiles(Main.java:329)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.dx.command.dexer.Main.run(Main.java:206)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at java.lang.reflect.Method.invoke(Method.java:616)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.ide.eclipse.adt.internal.build.DexWrapper.run(DexWrapper.java:179)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:745)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:647)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:629)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:172)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:282)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:363)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.resources.Project$1.run(Project.java:545)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1975)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:524)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.resources.Project.build(Project.java:123)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.ide.eclipse.adt.internal.project.ProjectHelper.build(ProjectHelper.java:869)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at com.android.ide.eclipse.adt.internal.launch.LaunchConfigDelegate.launch(LaunchConfigDelegate.java:146)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:853)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:702)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:924)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1128)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx   at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
  [2011-12-08 21:56:42 - JellyBallsFree] Dx 1 error; aborting
  [2011-12-08 21:56:42 - JellyBallsFree] Conversion to Dalvik format failed with error 1
  </code></pre>