Index (zero based) must be greater than or equal to zero and less than the size of the argument list

Hello friends, I found a weird issue during a USD configuration, I was getting error message “Index (zero based) must be greater than or equal to zero and less than the size of the argument list“, when I was trying to assign a custom entity record to a different agent (systemuser) using USD action call.

Scenario: A CRM custom entity record get created in Unified Service Desk when an agent receives a customer call. And if agent transfer customer call to their supervisor, same entity record should also get assigned to supervisor. Below are the details of the action call I created.

Issue: action call was failing with error message “Index (zero based) must be greater than or equal to zero and less than the size of the argument list“, complete error message was

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Action Call# 20

Source:Window Route(CTI Window Navigation Rule – Transfer Call)