Cannot execute dex: multiple dex files define Lcom / 9oldandroids / animation / Animator $ AnimatorListener;

Question

I repeatedly get an error while building apk. They performed such basic functions as cleaning, updating and restarting the eclipse, but still did not receive permission. Here is the error log.

com.android.dx.util.DexException: Multiple dex files define Lcom/nineoldandroids/animation/Animator$AnimatorListener; at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:592) at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:550) at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:531) at com.android.dx.merge.DexMerger.mergeDexBuffers(DexMerger.java:168) at com.android.dx.merge.DexMerger.merge(DexMerger.java:186) at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:300) at com.android.dx.command.dexer.Main.run(Main.java:232) at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.android.ide.eclipse.adt.internal.build.DexWrapper.run(DexWrapper.java:187) at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:813) at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:597) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:321) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:396) at org.eclipse.core.internal.resources.Project$1.run(Project.java:618) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344) at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:597) at org.eclipse.core.internal.resources.Project.build(Project.java:124) at com.android.ide.eclipse.adt.internal.project.ProjectHelper.doFullIncrementalDebugBuild(ProjectHelper.java:1116) at com.android.ide.eclipse.adt.internal.launch.LaunchConfigDelegate.launch(LaunchConfigDelegate.java:147) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:855) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:704) at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1047) at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1251) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) 

Answer 1

I think the fact is that these bans, whether direct or indirect, must be unique.