Email notification to requester after activation of vendor using SAP MDG -BP

Hi Everyone,

I have referred the below documents link and maintained the sub workflow to trigger an email after completion of the BRF+ workflow.

https://blogs.sap.com/2014/04/21/mdg-m-how-to-send-an-email-notification-to-the-requestor-at-time-of-material-activation/

I have created the Sub Workflow in SWDD and created a class but it is giving dump.

Kindly help me to find the ABAP code "ABAP Code to Get Email Receiver.txt." for the class as mentioned in the document or help me understand what exactly needs to be done.

I am not ab ABAPer so finding it difficult to do it on own.

Thank you

A