Name that you are passing is a property set not string. So, you need to set it's data type as Hierarchy and storage also as hierarchy.

and in business service you need to do

var x = input.GetChild(0);

Then you will be able to get hierarchy that you have passed.

There is another question for you. How are you calling this business service
via script or via workflow ????

hard luck mate :)

If you know there is error on line 5 then why don't you fix it :)

but there is no way in eScript to resume from where error occurred. You can suppress error but the control will go to finally clause or catch clause.

This thing might be possible with a combination of eScript and workflow but I have never tried that.