Syntax Error while using FindIndex in TestStand Functions

Hi All,

I used this function long before which was working for me, but not sure what i am doing wrong not able to get my work done.

This is my scenario,

I have a Local variable  1D array of String assume (Locals.XXX)

i need to get First element value

I used the Below syntax

FindIndex(Locals.XXX,1,True)

Advice me what i am doing wrong