On your text file, in the first line, change ‘kirupatext=’ to ‘scroller=’; I used that tut in one of my sites and had to change all of them to different names.
Be careful with your cache. Check the AS trick or the Best Of Kirupa, the “Tricks of the Trade” thread. Not sure it’s the answer thought, I can’t have a look at your files :-\
Your scrollbar doesn’t seem to have been dropped on the text box after you gave it an instance name. You must go to the ‘parameters’ of the scrollbar itself. That’s under the properties panel. Change the Target TextField to ‘scroller’ so that everything matches.