Inside assign activity:-
ensure that the passed argument inout_dt… is not null and check the argument settings from the invoke workflow file activities and its variables.
You also can debug and check variables / arguments to locate the part where it is breaking
What are you trying to do? Your code is trying to set your variables to a function (NewRow). That’s not how you add a row to a DT.
I dont see variable drItemDetails created in screenshots.
In one screenshot, its name is drItemDetails and in another its inout_dtblItemdetails…
Which is the right one?
drItemDetails is where error is showing in assign activity.
as far as screenshot is concerned inside assign in to it’s drItemDetails & in value it’s inout_dtblItemdetails