I get the below error when i run my app.
12-17 12:34:02.414: W/dalvikvm(392): threadid=3:
thread exiting with uncaught exception (group=0x4001b188)
12-17 12:34:02.424: E/AndroidRuntime(392): Uncaught handler: thread main exiting due to uncaught exception
12-17 12:34:02.454: E/AndroidRuntime(392): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloworld/com.example.helloworld.HelloAndroid}: java.lang.NullPointerException
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.os.Handler.dispatchMessage(Handler.java:99)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.os.Looper.loop(Looper.java:123)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.ActivityThread.main(ActivityThread.java:4363)
12-17 12:34:02.454: E/AndroidRuntime(392): at java.lang.reflect.Method.invokeNative(Native Method)
12-17 12:34:02.454: E/AndroidRuntime(392): at java.lang.reflect.Method.invoke(Method.java:521)
12-17 12:34:02.454: E/AndroidRuntime(392): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-17 12:34:02.454: E/AndroidRuntime(392): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-17 12:34:02.454: E/AndroidRuntime(392): at dalvik.system.NativeStart.main(Native Method)
12-17 12:34:02.454: E/AndroidRuntime(392): Caused by: java.lang.NullPointerException
12-17 12:34:02.454: E/AndroidRuntime(392): at com.example.helloworld.HelloAndroid.speakWords(HelloAndroid.java:43)
12-17 12:34:02.454: E/AndroidRuntime(392): at com.example.helloworld.HelloAndroid.onStart(HelloAndroid.java:37)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.Activity.performStart(Activity.java:3723)
12-17 12:34:02.454: E/AndroidRuntime(392): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2468)
12-17 12:34:02.454: E/AndroidRuntime(392): ... 11 more
12-17 12:34:02.484: I/dalvikvm(392): threadid=7: reacting to signal 3
12-17 12:34:02.644: I/dalvikvm(392): Wrote stack trace to '/data/anr/traces.txt'
12-17 12:34:07.995: I/Process(392): Sending signal. PID: 392 SIG: 9
12-17 12:35:31.255: D/AndroidRuntime(418): Shutting down VM
12-17 12:35:31.255: W/dalvikvm(418): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
12-17 12:35:31.267: E/AndroidRuntime(418): Uncaught handler: thread main exiting due to uncaught exception
12-17 12:35:31.285: E/AndroidRuntime(418): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloworld/com.example.helloworld.HelloAndroid}: java.lang.NullPointerException
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.os.Handler.dispatchMessage(Handler.java:99)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.os.Looper.loop(Looper.java:123)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.ActivityThread.main(ActivityThread.java:4363)
12-17 12:35:31.285: E/AndroidRuntime(418): at java.lang.reflect.Method.invokeNative(Native Method)
12-17 12:35:31.285: E/AndroidRuntime(418): at java.lang.reflect.Method.invoke(Method.java:521)
12-17 12:35:31.285: E/AndroidRuntime(418): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-17 12:35:31.285: E/AndroidRuntime(418): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-17 12:35:31.285: E/AndroidRuntime(418): at dalvik.system.NativeStart.main(Native Method)
12-17 12:35:31.285: E/AndroidRuntime(418): Caused by: java.lang.NullPointerException
12-17 12:35:31.285: E/AndroidRuntime(418): at com.example.helloworld.HelloAndroid.speakWords(HelloAndroid.java:43)
12-17 12:35:31.285: E/AndroidRuntime(418): at com.example.helloworld.HelloAndroid.onStart(HelloAndroid.java:37)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.Activity.performStart(Activity.java:3723)
12-17 12:35:31.285: E/AndroidRuntime(418): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2468)
12-17 12:35:31.285: E/AndroidRuntime(418): ... 11 more
12-17 12:35:31.325: I/dalvikvm(418): threadid=7: reacting to signal 3
12-17 12:35:31.447: I/dalvikvm(418): Wrote stack trace to '/data/anr/traces.txt'
12-17 12:35:35.284: I/Process(418): Sending signal. PID: 418 SIG: 9