我是Java编程的新手，我目前正在开发我的第一个Android应用程序。 一切都很好，我可以用一些代码启动我的应用程序。 然后我尝试为一个漂亮的导航抽屉制作以下教程：http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/
我把所有代码放在我的项目中，但现在有一些错误：
Error:Android Dex: [GFXSector] Unable to execute DX
Error:Android Dex: [GFXSector] com.android.dex.DexException: Multiple dex files define Landroid/support/v13/app/FragmentCompat$FragmentCompatImpl;
Error:Android Dex: [GFXSector] at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:594)
Error:Android Dex: [GFXSector] at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:552)
Error:Android Dex: [GFXSector] at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:533)
Error:Android Dex: [GFXSector] at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:170)
Error:Android Dex: [GFXSector] at com.android.dx.merge.DexMerger.merge(DexMerger.java:188)
Error:Android Dex: [GFXSector] at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:439)
Error:Android Dex: [GFXSector] at com.android.dx.command.dexer.Main.runMonoDex(Main.java:287)
Error:Android Dex: [GFXSector] at com.android.dx.command.dexer.Main.run(Main.java:230)
Error:Android Dex: [GFXSector] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Error:Android Dex: [GFXSector] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
Error:Android Dex: [GFXSector] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Error:Android Dex: [GFXSector] at java.lang.reflect.Method.invoke(Method.java:606)
Error:Android Dex: [GFXSector] at org.jetbrains.android.compiler.tools.AndroidDxRunner.runDex(AndroidDxRunner.java:161)
Error:Android Dex: [GFXSector] at org.jetbrains.android.compiler.tools.AndroidDxRunner.main(AndroidDxRunner.java:294)
Error:Android Dex: [GFXSector] at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:121)
Error:Android Dex: [GFXSector] Picked up _JAVA_OPTIONS: -Xmx512M
Warning:Android Pre Dex: [android-support-v13.jar] Picked up _JAVA_OPTIONS: -Xmx512M
你有任何想法如何解决它？