ViewAnimator causes NullPointerException
===

Hey i'm trying to use ViewAnimator and i probably am missing something basic.
This is what i have :

    		va = new ViewAnimator(this);
		va.setInAnimation(inFromLeftAnimation());
		va.setOutAnimation(outToRightAnimation());

		RelativeLayout stage = (RelativeLayout)findViewById(R.layout.american_stage);
		va.addView(stage,0);

		
		setContentView(va);

Where inFromLeftAnimation and outToRightAnimation just handles animations and works perfectly.
And ofcourse that the file really exists...
I Get this log :

 

       07-13 15:45:14.515: E/AndroidRuntime(564): java.lang.RuntimeException: Unable to start activity ComponentInfo{shibby.webhunt/shibby.webhunt.ArcadeModeActivity}: java.lang.NullPointerException
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.ActivityThread.access$2300(ActivityThread.java:125)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.os.Handler.dispatchMessage(Handler.java:99)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.os.Looper.loop(Looper.java:123)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.ActivityThread.main(ActivityThread.java:4627)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at java.lang.reflect.Method.invokeNative(Native Method)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at java.lang.reflect.Method.invoke(Method.java:521)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at dalvik.system.NativeStart.main(Native Method)
    07-13 15:45:14.515: E/AndroidRuntime(564): Caused by: java.lang.NullPointerException
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.view.ViewGroup.addView(ViewGroup.java:1815)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at shibby.webhunt.ArcadeModeActivity.onCreate(ArcadeModeActivity.java:25)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    07-13 15:45:14.515: E/AndroidRuntime(564): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)


And i have no idea why.
Is it impossible to use XML files as views? do i have to build the views myself?