Mathscript in VIs to use in Teststand

Hi,

I'm using Teststand to create a small test sequence where I need to use a VI with a MathScript Node executed by MathScript RT Module. In MathScript Node I have a filter_zerophase and when I add this VI to an action in TestStand the message "Unable to load..." appears on Module tab. If I remove the filter_zerophase of the MathScript node everything works fine. Any one knows why this happens?

In this link (http://zone.ni.com/reference/en-XX/help/373123C-01/lvtextmath/msfunc_filter_zerophase/) we can see that filter_zerophase is supported in the LabVIEW Run-Time Engine.

Thanks,

Ruben