Dynamic approver based on login user

Summary

Dynamic approver based on login user using advanced Selection for approver select

Content

Dear all,

We have created a table for the dynamic approver, based on login the approver should change.
but when we submit the quote, email is sending to the approver but when user trying to approve the quote it is giving an error.

" An error has occurred while trying to process your request.  No changes have been saved.  Details of the error are:

Could not perform Action: Approve[Submit] User not found with login name, "

please check the adv BML code for approver setup

currentUserlogin = _system_user_login;