[Gtk-sharp-list] Unable to run an app on MonoDevelop

[optimus_prime]

Hi,
I was trying out to learn building an application for the XO laptop using
Mono (to use C# on another platform). I have been following this link to
develop a small "HelloWorld!" Activity.
http://www.codeproject.com/KB/cross-platform/monosugar.aspx?display=Print

I am currently using Mono on Windows 7. Although, there is no error in the
application, but on trying to run the application, a dialgue box appear
saying "LabActivity" (name of the program) has stopped working.
Screenshot:http://img84.imageshack.us/i/scrf.png/

There's some description displayed in the Error/Message box in MonoDevelop.
Screenshot: http://img94.imageshack.us/i/scr2f.png/
Please could somebody explain me the problem? 
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