Adding active directory user to organization


I tried integration of chef server with active directory. I am not able to add user to organization. Please find the error log below.

chef-server-ctl org-user-add org_name user_name
ERROR: The object you are looking for could not be found
Response: Could not find user user_name

Is it mandatory that every domain user should have one local user in chef? can some one guide how to start using ldap users…