problem creating EM on oracle 11gR1

 Hi all,
I am getting this error while i am creating EM on oracle 11gR1.

SQL> show parameter listener

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
listener_networks                    string
local_listener                       string      (ADDRESS = (PROTOCOL = TCP)(HOST = hostname.domain)(PORT = 1521))

I have registered my listener with my database.
Please find my listener.ora:

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = hostname.domain)(PORT = 1521))
    )
  )


SID_LIST_LISTENER =
  (SID_LIST =
     (SID_DESC =
        (SID_NAME = Excel_SID)
        (ORACLE_HOME = /oracle/app/oracle/product/11.2)
        (PROGRAM = dg4odbc)
     )
     (SID_DESC =
        (SID_NAME = PLSExtProc)
        (ORACLE_HOME = /oracle/app/oracle/product/11.2)
        (PROGRAM = extproc)