Android :: MapActivity Error - Force Close

I create new MapActivity class ClassProba.

From main Activity I want to show MapActivity, on bitton click event I put this code:

CODE:..............

But I receive Force close error.

In my xml file I use this code:

CODE:......

In log I receive this error :

CODE:..

Line 7 is com.google.android.maps.MapView

When I remove this code form xml file :

CODE:.....

Blank black screen appear (there is no error)

In manifest file I have:

CODE:..............

UPDATE

CODE:...............