Just wish I knew how. In my program I had to remove the line "$scrollpane = $scrollpane->Subwidget('scrolled');",

That error probably comes from the line

$scrollpane = $scrollpane->Subwidget('scrolled');
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You can't have $scrollpane in both variable positions. You would use

my $real_pane = $scrollpane->Subwidget('scrolled');
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but that didn't work for me either. I also suspect it has something to do with you using nested frames with the ScrolledPane. My first guess as to why, is possibly the expand and fill options of the frames. I'm not that familiar with the Form manager.