Android Build fail - java.lang.IllegalArgumentException: already added: Lcom/google/api/client/escape/CharEscapers;

Question

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.

here is building log:

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

Answer 1

You have same jar library included twice. Check your application and all referenced Android libraries and make sure you have all jars included exactly once.

If that does not help, take a look at http://tools.android.com/knownissues. Specifically look at first issue described in Build System section.

Also you can read this post: How to fix the “Conversion to Dalvik format failed with error 1"