[MonoTouch] Tabbed project sample error

[Alphapage]

Hello,
I try the tabbed project.

It is working in the Iphone simulator.
But when I try to deploy to my device 3.1.3, I get an exception in 
window.RootViewController = tabBarController;

I set the project to target 3.0: the first time I had to change:
this.TabBarItem.Image = UIImage.FromBundle ("Images/first");
to
this.TabBarItem.Image = UIImage.FromBundle ("Images/first.png");
???

After I get this exception:
"objective c exception thrown NSInvalidArgumentexception *** UIIwindow
setrootviewcontroller unrecognized selection sent to instance 0x753920

Thanks in advance for your help.

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