Image detecting problem

I'm trying ImageSearch and cannot get it to work. Here is the code.


Basically I'm getting syntax error on a line 3 and char 13 which is not logical since everything match example in docs http://www.autohotkey.com/docs/commands/ImageSearch.htm

Any tips or ideas are highly appreciated.

P.S.
Few additional questions:

What is most common number of *n (variation) in ImageSearch for best matching capability? (I currently have put 2)
What is best format to save screen-shoot in?
Is there any other way of matching picture in active window that is maybe better that this one?