error

03-12 10:10:43.519: D/AndroidRuntime(2367): Shutting down VM
03-12 10:10:43.523: W/dalvikvm(2367): threadid=1: thread exiting with uncaught exception (group=0x40015578)
03-12 10:10:43.535: E/AndroidRuntime(2367): FATAL EXCEPTION: main
03-12 10:10:43.535: E/AndroidRuntime(2367): java.lang.RuntimeException: Unable to start activity ComponentInfo{se.saxman.Json/se.saxman.Json.MainActivity}: java.lang.NullPointerException
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.os.Handler.dispatchMessage(Handler.java:99)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.os.Looper.loop(Looper.java:130)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.ActivityThread.main(ActivityThread.java:3687)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at java.lang.reflect.Method.invokeNative(Native Method)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at java.lang.reflect.Method.invoke(Method.java:507)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at dalvik.system.NativeStart.main(Native Method)
03-12 10:10:43.535: E/AndroidRuntime(2367): Caused by: java.lang.NullPointerException
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at se.saxman.Json.MainActivity.onCreate(MainActivity.java:36)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
03-12 10:10:43.535: E/AndroidRuntime(2367): 	... 11 more
03-12 10:10:53.917: I/Process(2367): Sending signal. PID: 2367 SIG: 9