Scrolling Text setCharacters

Just learning smalltalk & squeak. One of the first things I wanted to try was to load text into a scroll morph at the press of a button.

I  renamed the Scrolling Text morph scroll.
And I put the following code underneath button.
Everything seems fine but the last line

The error I get back is that scroll is an unknown variable.

So my question is am I referencing the scroll morph correctly in the button script?

button
    | stream data |
    Transcript show: 'hello'.
    
"Read file into a string"
    stream _ FileStream fileNamed: 'test.txt'.
    data _ stream contentsOfEntireFile.
    stream close.
    Transcript show: data.
    scroll setCharacters: data.



Thanks in advance

Steve
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