I am getting following error while trying to set up replication ? Can somebody help ?

./slonik_subscribe_set 1 2 | ./slonik
<stdin>:5: PGRES_FATAL_ERROR select max(ev_seqno) FROM "_replication".sl_event , "_replication".sl_node  where ev_origin="_replication".getLocalNodeId('_replication')  AND ev_type <> 'SYNC'  AND sl_node.no_id= ev_origin - ERROR:  function _replication.getlocalnodeid(unknown) does not exist
LINE 1: ...l_event , "_replication".sl_node  where ev_origin="_replicat...
                                                             ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
error: unable to query event history on node 2
waiting for events  (2,221473472232) only at (2,0) to be confirmed on node 1

Thanks in advance,
Samir
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