rebalance fails with not my vbucket error

Running install then the medium load rebalance test (management.rebalancetests.IncrementalRebalanceInTests.test_medium_load) caused rebalance to fail.

Rebalance exited with reason {{case_clause,
{{ok,dead},

{memcached_error,not_my_vbucket, <<"That's not my bucket.">>}

}},
[

{ns_vbucket_mover,run_mover,5}

,

{ns_vbucket_mover,'-spawn_workers/1-fun-0-', 7}

]}
ns_orchestrator002 ns_1@10.1.5.227 15:52:53 - Fri May 13, 2011
Starting rebalance, KeepNodes = ['ns_1@10.1.5.227'], EjectNodes = ['ns_1@10.1.5.228',
'ns_1@10.1.6.73',
'ns_1@10.1.5.229']
ns_orchestrator004 ns_1@10.1.5.227 15:50:45 - Fri May 13, 2011
Rebalance exited with reason {badmatch,{error,timeout,
[

{mc_client_binary,cmd_binary_vocal_recv,5}

,

{mc_client_binary,get_vbucket,2}

,

{ns_memcached,handle_call,3}

,

{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}

]},
{gen_server,call,
[

{'ns_memcached-default','ns_1@10.1.5.227'}

,

{get_vbucket,168}

,
30000]}}
ns_orchestrator002 ns_1@10.1.5.227 15:50:37 - Fri May 13, 2011
Bucket "default" loaded on node 'ns_1@10.1.5.227' in 0 seconds. ns_memcached001 ns_1@10.1.5.227 15:50:37 - Fri May 13, 2011
Control connection to memcached on 'ns_1@10.1.5.227' disconnected: {{badmatch,
{error,
timeout}},
[

{mc_client_binary, cmd_binary_vocal_recv, 5}

,

{mc_client_binary, get_vbucket, 2}

,

{ns_memcached, handle_call, 3}

,

{gen_server, handle_msg, 5}

,

{proc_lib, init_p_do_apply, 3}

]}