Replication error

Hi,

I want to configure Advanced Replication.

I have two sites one as master and another as snapshot.

I could create the master objects and replication support in the master site.

When i create the snapshot group in the snapshot site. It prompts an error:

DECLARE
CREATE_SNAPSHOT_REPGROUP VARCHAR2(10);
BEGIN
DBMS_REPCAT.CREATE_SNAPSHOT_REPGROUP('MG3','DBS3.TIL.COM','THIRDSNAPGROUP on FEB-23','ASYNCHRONOUS');
END;

/

ERROR at line 1:
ORA-06550: line 1, column 8:
PLS-00201:
identifier '[email protected]' must be declared
ORA-06550: line 1, column 8:
PL/SQL: Statement ignored
ORA-06550: line 1, column 7:
PLS-00201: identifier '[email protected]' must be
declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
ORA-06512: at "SYS.DBMS_REPCAT_UTL", line 2215
ORA-06512: at "SYS.DBMS_REPCAT_SNA_UTL", line 1539
ORA-06512: at "SYS.DBMS_REPCAT_SNA", line 64
ORA-06512: at "SYS.DBMS_REPCAT", line 1045
ORA-06512: at line 4

Could any one tell me what is the problem.

Thanks in advance.

bye
gandhi