getting ERROR when starting memcached service (no replies)

hi

i am working on memcached implementain of NoSQL access to mysql cluster 7.2
i am installed libmemcached and memcached 1.6 version..
but when starting the memcached i am faceing error "open_connections_to_all_clusters() failed"

like

memcached -E /usr/local/mysql/lib/ndb_engine.so -e "connectstring=10.12.200.117:1186;role=db-only;debug=true" -vv -c 20 -u root

main --> ndb_initialize()
main print_debug_startup_info(): sizeof Ndb : 144
main print_debug_startup_info(): sizeof NdbInstance : 64
main print_debug_startup_info(): sizeof workitem : 136
main print_debug_startup_info(): sizeof ExternalValue : 96
main --> connect_to_primary_cluster()
22-Mar-2012 15:48:39 IST NDB Memcache 5.5.19-ndb-7.2.4 started [NDB 7.2.4; MySQL 5.5.19]
Contacting primary management server (10.12.200.117:1186) ...
main --> ClusterConnectionPool::connect()
Connected to "10.12.200.117:1186" as node id 6.
main --> Configuration::fetch_meta_record()
main get_supported_version(): 1.2
main --> config_v1::read_configuration()
main get_server_role_id(): Name: "db-only" -- ID: 1
main --> config_v1::get_policies()
main get_policies(): ndb-only: get-2 set-2 del-2 flush-1 addr-0x8861898
main get_policies(): caching: get-3 set-3 del-3 flush-1 addr-0x88652c0
main get_policies(): memcache-only: get-1 set-1 del-1 flush-1 addr-0x88aa9e8
main get_policies(): ndb-test: get-2 set-2 del-2 flush-2 addr-0x88aaa20
main get_policies(): caching-with-local-deletes: get-3 set-3 del-1 flush-1 addr-0x8866b08
main get_policies(): ndb-read-only: get-2 set-4 del-4 flush-1 addr-0x8867c60
main --> config_v1::get_connections()
main --> store_connection_pool_for_cluster()
main get_connections(): [0]: { 0 => "10.12.200.117" [rtt: 250]}
main get_connections(): clusters: 1
main --> config_v1::get_prefixes()
main QueryPlan(): Using Index: PRIMARY on Table: key_prefixes [SCAN]
main get_container_record(): "demo_table" found in database (demo_table).
main get_container_record(): "demo_ext" found in database (demo_table_large).
main get_container_record(): "demo_tabs" found in database (demo_table_tabs).
main --> config_v1::log_signon()
main set_initial_cas(): Sign On GCI: 0xbb450000000b | Node Id: [6] 0x60000000 | Engine bit: 0x1000000000
main set_initial_cas(): Initial CAS: 6589031198490624 0x1768b060000000
main --> config_v1 destructor()
Retrieved 3 key prefixes for server role "db-only".
The default behavior is that:
GET uses NDB only
SET uses NDB only
DELETE uses NDB only.
The 2 explicitly defined key prefixes are "b:" (demo_table_large) and "t:" (demo_table_tabs)
main --> Configuration::openAllConnections()
main --> ClusterConnectionPool::connect()
open_connections_to_all_clusters() failed
main --> ndb_destroy()
Segmentation fault

can any ony help me out in finding solution on this

thanks in adv
Deepak M