关于android：“不幸的是我的第一个应用程序已停止工作

"Unfortunately My First App has stopped working

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我刚刚下载并开始使用Android SDK，并按照他们的说明创建了"我的第一个应用程序"，上面写着"你好，世界"，我没有更改任何代码。我正在运行一个Nexus7模拟器(只有一个不会在每次运行时崩溃)。当我运行这个应用程序时，它在模拟器上说，"不幸的是，我的第一个应用程序已经停止工作了。"

这是logcat：

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05-16 13:05:48.742: W/dalvikvm(1066): VFY: unable to resolve static field 1559 (ActionBarWindow) in Landroid/support/v7/appcompat/R$styleable;
05-16 13:05:48.742: D/dalvikvm(1066): VFY: replacing opcode 0x62 at 0x0004
05-16 13:05:48.752: D/AndroidRuntime(1066): Shutting down VM
05-16 13:05:48.752: W/dalvikvm(1066): threadid=1: thread exiting with uncaught exception (group=0xb2ac5ba8)
05-16 13:05:48.812: E/AndroidRuntime(1066): FATAL EXCEPTION: main
05-16 13:05:48.812: E/AndroidRuntime(1066): Process: com.example.myfirstapp, PID: 1066
05-16 13:05:48.812: E/AndroidRuntime(1066): java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$styleable
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:107)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:58)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
05-16 13:05:48.812: E/AndroidRuntime(1066): at com.example.myfirstapp.MainActivity.onCreate(MainActivity.java:18)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.Activity.performCreate(Activity.java:5231)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.ActivityThread.access$800(ActivityThread.java:135)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.os.Handler.dispatchMessage(Handler.java:102)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.os.Looper.loop(Looper.java:136)
05-16 13:05:48.812: E/AndroidRuntime(1066): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-16 13:05:48.812: E/AndroidRuntime(1066): at java.lang.reflect.Method.invokeNative(Native Method)
05-16 13:05:48.812: E/AndroidRuntime(1066): at java.lang.reflect.Method.invoke(Method.java:515)
05-16 13:05:48.812: E/AndroidRuntime(1066): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-16 13:05:48.812: E/AndroidRuntime(1066): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-16 13:05:48.812: E/AndroidRuntime(1066): at dalvik.system.NativeStart.main(Native Method)
05-16 13:05:51.822: I/Process(1066): Sending signal. PID: 1066 SIG: 9

有什么想法吗？同样，这是创建新应用时的默认代码，所以我不确定为什么它不能工作…谢谢你的帮助