Getting Error while enabling user in Efflux Migrator

Hi, The Security Identifier (SID) attributes are associated with user accounts and I am migrating them from one domain to another with Efflux Migrator and when I click to enable the user, I got this error. How can it be resolved? plz help!
 

There are few pre-requisites which are required for moving SID for users. Please see below kb article which explains these in detail and will surely help you too :
https://portal.effluxmigrator.com/kb/a2321/requirements-for-moving-security-identifier-sid-attributes-from-source-to-target-domain_.aspx