Failed to create attribute cn=. Error code = 8206.
If you get this error while trying to extend your schema for Configuration Manager 2007, it may be because your account may not have enough privileges to do so…yes even if you are the administrator (check the C:ExtADSch.log). To do this, make sure you have your schmmgmt.dll registered before you can add this console into MMC. Once opened, add the Active Directory Schema console into your MMC. From there assign the account you are using to have rights to update the schema.