Problem with calling a VI using DIADEM script : Interpolation

Hello community.
I wanted to use my subVI attached using DIAdem script. So, I referred this material. I know DIAdem already have the function of Interpolation, But I just tried to improve performance of my project, So I chose interpolation from LabVIEW.

VI is so simple. But, In this process, I got error like this.

(※ 'Output', 'VI' are variable what i defined )

" 

Call VI.Run(true)

Answer = VI.GetControlValue("Output")
"

Before I got 'output' from VI, I think I did execution 'Call VI.Run(true)'. Anyone knows how can I solve this problem?

Thank you in advance.