Runtime exceptions in SQLite data entry and retrieval

I'm getting run-time exceptions while running my project on eclipse. Could someone tell me the meaning of the errors in the following stack trace.

07-09 07:19:27.925: E/AndroidRuntime(7537):     at     android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.os.Looper.loop(Looper.java:137)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.ActivityThread.main(ActivityThread.java:5103)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at java.lang.reflect.Method.invokeNative(Native Method)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at java.lang.reflect.Method.invoke(Method.java:525)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at dalvik.system.NativeStart.main(Native Method)
07-09 07:19:27.925: E/AndroidRuntime(7537): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.ListActivity.onContentChanged(ListActivity.java:243)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.Activity.setContentView(Activity.java:1895)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at com.example.databasetrial3.MainActivity.onCreate(MainActivity.java:22)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.Activity.performCreate(Activity.java:5133)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-09 07:19:27.925: E/AndroidRuntime(7537):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)