我试图从E3roid示例运行示例。除了我什么时候，我都会在页面上强行关闭。这是logcat错误。通过查看它，您能否告诉我这意味着什么，什么问题？

02-28 20:31:51.429: D/AndroidRuntime(1779): Shutting down VM
02-28 20:31:51.429: W/dalvikvm(1779): threadid=1: thread exiting with uncaught exception (group=0x40015578)
02-28 20:31:51.429: E/AndroidRuntime(1779): FATAL EXCEPTION: main
02-28 20:31:51.429: E/AndroidRuntime(1779): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{and.roid/and.roid.AndroidActivity}: java.lang.ClassNotFoundException: and.roid.AndroidActivity in loader dalvik.system.PathClassLoader[/data/app/and.roid-1.apk]
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.os.Looper.loop(Looper.java:130)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.ActivityThread.main(ActivityThread.java:3687)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at java.lang.reflect.Method.invokeNative(Native Method)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at java.lang.reflect.Method.invoke(Method.java:507)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at dalvik.system.NativeStart.main(Native Method)
02-28 20:31:51.429: E/AndroidRuntime(1779): Caused by: java.lang.ClassNotFoundException: and.roid.AndroidActivity in loader dalvik.system.PathClassLoader[/data/app/and.roid-1.apk]
02-28 20:31:51.429: E/AndroidRuntime(1779):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-28 20:31:51.429: E/AndroidRuntime(1779):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
02-28 20:31:51.429: E/AndroidRuntime(1779):     ... 11 more
02-28 20:31:57.820: I/Process(1779): Sending signal. PID: 1779 SIG: 9
02-28 20:34:48.691: D/AndroidRuntime(2072): Shutting down VM
02-28 20:34:48.691: W/dalvikvm(2072): threadid=1: thread exiting with uncaught exception (group=0x40015578)
02-28 20:34:48.691: E/AndroidRuntime(2072): FATAL EXCEPTION: main
02-28 20:34:48.691: E/AndroidRuntime(2072): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{and.roid/and.roid.AndroidActivity}: java.lang.ClassNotFoundException: and.roid.AndroidActivity in loader dalvik.system.PathClassLoader[/data/app/and.roid-1.apk]
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.os.Looper.loop(Looper.java:130)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.ActivityThread.main(ActivityThread.java:3687)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at java.lang.reflect.Method.invokeNative(Native Method)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at java.lang.reflect.Method.invoke(Method.java:507)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at dalvik.system.NativeStart.main(Native Method)
02-28 20:34:48.691: E/AndroidRuntime(2072): Caused by: java.lang.ClassNotFoundException: and.roid.AndroidActivity in loader dalvik.system.PathClassLoader[/data/app/and.roid-1.apk]
02-28 20:34:48.691: E/AndroidRuntime(2072):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-28 20:34:48.691: E/AndroidRuntime(2072):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
02-28 20:34:48.691: E/AndroidRuntime(2072):     ... 11 more
02-28 20:34:56.511: I/Process(2072): Sending signal. PID: 2072 SIG: 9