Rebalance fails with reason {noproc, {gen_server,call, [{'janitor_agent-default','ns_1@10.2.2.60'} when rebalance is stopped/resumed

-t viewquerytests.ViewQueryTests.test_employee_dataset_alldocs_queries_start_stop_rebalance_in_incremental,limit=10000,skip_rebalance=true
6 views, queries are performed alone all test. 200K items, 1 bucket
Test incrementally rebalance in. Rebalance is stopped on 30 and 60 % and then launched again.

2012-10-06 19:28:41.650 ns_vbucket_mover:0:critical:message(ns_1@10.2.2.60) - <0.18374.49> exited with {noproc,
{gen_server,call,
[

{'janitor_agent-default','ns_1@10.2.2.60'},
{if_rebalance,<0.18365.49>,
{update_vbucket_state,814,active,paused,
undefined}},
infinity]}}
2012-10-06 19:28:41.656 ns_orchestrator:2:info:message(ns_1@10.2.2.60) - Rebalance exited with reason {noproc,
{gen_server,call,
[{'janitor_agent-default','ns_1@10.2.2.60'}

,
{if_rebalance,<0.18365.49>,
{update_vbucket_state,814,active,paused,
undefined}},
infinity]}}