Transfer of username and computers from 1 server to other

[opensky]

I want to export computer name also with users account in Active directory from 1 server to other(server2). I issued following command:

ldifde -f exportuser.ldf

and when i am importing these account at other(server2) server:

ldifde -i -f exportuser.ldf -s server2

The command is showing following error:

"
Connecting to "server2"
Logging in as current user using SSPI
Importing directory from file "exportu2.ldf"
Loading entries.
Add error on line 1: Unwilling To Perform
The server side error is "Access to the attribute is not permitted because the attribute is owned by the Security Accounts Manager (SAM)."
0 entries modified successfully.
An error has occurred in the program
"

Please note that i just installed a new server with same domain and dns "server2". So i don't want to avoid add all of my computers 1 by 1 again in this new server and user too.

Thanks in advance