Operation ‘create’ on object ‘registered’ server

I am facing an unexpected error in Registered Servers. The error is 35012. What is this? How it can be solved? Any idea.

Registered server
Operation ‘create’ on object ‘registered’ server [@Name=’DCKLEE3SQL2008A’] failed during execution.
Additional Information:
An exception occurred while executing a Transact-SQL statement Or batch.
(Microsoftft.SqlServer.ConnectionInfo)
You cannot add a shared registered server with the same name as the configuration server. (Microsoft SQL Server, Error:35012)
OK
