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An update to the above issues is:
This is Application output for the same:
NSUserNotification is an API introduced in Mountain Lion and as such does not/is not expected to work in anything older.
I changed this sample to show an alert indicating the API is not supported so it does not crash on Lion.
Today we have verified this issue with following builds:
X.S 4.0 - 0a40582a1d122994063594ea2ea725960c26b671
Now application is not crashing.