I am trying to import CRM organization by selecting manual mapping and map only one Active Directory user 'CRM_SETUP' with CRM Admin user  'Admin_CRM'.  At the end Organization, not imports successfully and  I get log file with Error

An Error was encountered while processing user 'Admin_CRM' with account Domain\CRM_SETUP

The Specified Active Directory user already exists as a CRM user'

I verified in Sql server 'SystemUserBase' there is no user with the domain Domain\CRM_SETUP name.

CRM_SETUP user has full access to OU and SQL Data Base.