Did anyone try using "Call Virtual User Generator Script" from toolbox for API testing?

For testing one my functionality I want to call VUGEN script in my APItest in UFT. I added the "Call Virtual User Generator Script" from toolbox to my test. But I am unable to give the script path. In the screenshot attached calling vugen script from UFT error, when I am trying to locate the error to give the path of my vugen script I am not even getting the popup to select the path. Did anyone try this option or is there any known issue with UFT for calling vugen script.

Thanks in advance for any help or suggestions.

I do NOT have VUGen installed on my system. But in order to update the script path, you need to update in Properties section of that activity.

To view the Property section, click:

View -> Properties

Now from here click on the highlighted button and it will give you the script selection window.