Could somebody please give me some help?
I tried putting

stat.file = $out.stat

line in the params file, to see if it makes any difference, but no luck there.
There is only one out.stat file in ecj's root folder and this never gets changed.
When I run the tutorial, is it supposed to create a new out.stat file somewhere?
I would like to see the results of my GP in a tree like form visually.