title: My android app suddenly stopped working. Can someone help by deciphering my log cat?
body: <pre><code>12-20 13:52:15.071: D/AndroidRuntime(278): Shutting down VM
  12-20 13:52:15.081: W/dalvikvm(278): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
  12-20 13:52:15.100: E/AndroidRuntime(278): FATAL EXCEPTION: main
  12-20 13:52:15.100: E/AndroidRuntime(278): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ebonybutler.cexample3/com.ebonybutler.cexample3.Main}: java.lang.NullPointerException
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.os.Handler.dispatchMessage(Handler.java:99)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.os.Looper.loop(Looper.java:123)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.ActivityThread.main(ActivityThread.java:4627)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at java.lang.reflect.Method.invokeNative(Native Method)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at java.lang.reflect.Method.invoke(Method.java:521)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at dalvik.system.NativeStart.main(Native Method)
  12-20 13:52:15.100: E/AndroidRuntime(278): Caused by: java.lang.NullPointerException
  12-20 13:52:15.100: E/AndroidRuntime(278):  at com.ebonybutler.cexample3.Main.onCreate(Main.java:21)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  12-20 13:52:15.100: E/AndroidRuntime(278):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
  12-20 13:52:15.100: E/AndroidRuntime(278):  ... 11 moreenter code here
  </code></pre>