ManageEngine ServiceDesk configuration Error

[Chinthaka Udakandage]

I have tried config the ManageEngine ServiceDesk template on a guide https://www.zabbix.com/integrations/manageengine, but Ticket is not sent.

configuration as


Error occurs


After I Check JSON Path on the ManageEngine ServiceDesk side it's like this



So, I change the configuration (1st screen shot point 1 parameter) to "field_string:requester_name". The error changes like this


How to resolve this..

Thank You
Chinthaka