I am using below expression to display First name from the list of username in g

I am using below expression to display First name from the list of username in grid text column component. I am getting " Error evaluating function 'user' : com.appiancorp.suiteapi.common.exceptions.InvalidUserException: [InvalidUserException]" . All the use are active user which i trying to populate on the grid.


Code:-

a!gridTextColumn(label:"First Name",field:"",data:fn!apply(FMS_CI_getFirstName(_) ,local!getUniqueList))

where FMS_CI_getFirstName
=user(ri!user,"firstName")

OriginalPostID-140742

OriginalPostID-140742