It looks like you have three variables that are undefined. And that’s why it’s failing. You’re using variables AuthorizedAmountMaster
, OutstandingBalance
, and NewFunds
but those are not defined as local variables or global variables so the expression fails.
It looks like you were trying to use the widget names of the other text fields. You can’t do that. Widget names are not unique so even if you could, it wouldn’t simply work that way. What if you have 20 widgets named OutstandingBalance?
Instead you should use local variables. Open the expression editor (the fx button) and in the bottom half of the window add local variables for each text field widget. Name them whatever you want, and set them to each widget’s text.
Example: LVAR1 = text on widget OutstandingBalance
Then you can use the local variables in your expression.
[[LVAR1 + LVAR2 + LVAR3]]
I suspect this is what the example you referenced did, but when you copied it you did not set the local variables.