this.rawValue = Number2Text.number2text(SForm.Table88.Row1.Cell1.rawValue); works fine
var ash = SForm.Table88.Row1.Cell1
this.rawValue = Number2Text.number2text(ash.rawValue); not working why?
Looks like you're using a script object with a custom function called number2text().
Without knowing that function, it's impossible to say why it wouldn't work.