问Android在构建时崩溃

EN

 UNEXPECTED TOP-LEVEL EXCEPTION:
 java.lang.IllegalArgumentException: already added: Lorg/acra/ACRA$1;
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.dex.file.DexFile.add(DexFile.java:163)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main.processClass(Main.java:486)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main.processFileBytes(Main.java:455)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main.access$400(Main.java:67)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:394)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:131)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:109)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main.processOne(Main.java:418)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main.processAllFiles(Main.java:329)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.dx.command.dexer.Main.run(Main.java:206)
 [2012-11-11 18:01:57 - phca] Dx    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [2012-11-11 18:01:57 - phca] Dx    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 [2012-11-11 18:01:57 - phca] Dx    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [2012-11-11 18:01:57 - phca] Dx    at java.lang.reflect.Method.invoke(Method.java:597)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.ide.eclipse.adt.internal.build.DexWrapper.run(DexWrapper.java:180)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:703)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:577)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:321)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:396)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.resources.Project$1.run(Project.java:618)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:597)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.core.internal.resources.Project.build(Project.java:124)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.ide.eclipse.adt.internal.project.ProjectHelper.doFullIncrementalDebugBuild(ProjectHelper.java:1000)
 [2012-11-11 18:01:57 - phca] Dx    at com.android.ide.eclipse.adt.internal.launch.LaunchConfigDelegate.launch(LaunchConfigDelegate.java:147)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:855)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:704)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1047)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.debug.internal.ui.DebugUIPlugin$7.run(DebugUIPlugin.java:1133)
 [2012-11-11 18:01:57 - phca] Dx    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
 [2012-11-11 18:01:57 - phca] Dx 1 error; aborting
 [2012-11-11 18:01:57 - phca] Conversion to Dalvik format failed with error 1