Janitor cleanup of "bucket" failed after failover

Janitor cleanup of "bucket-2" failed after failover of 'ns_1@10.1.3.74': {exit,
{shutdown,
{gen_server,
call,
[

{'ns_vbm_sup-bucket-2', 'ns_1@10.1.3.74'}

,
which_children,
infinity]}}}

2012-04-26 15:39:51.795 ns_memcached:1:info:message(ns_1@10.1.3.75) - Bucket "bucket-2" loaded on node 'ns_1@10.1.3.75' in 0 seconds.
2012-04-26 15:53:18.553 ns_rebalancer:0:critical:message(ns_1@10.1.3.74) - Janitor cleanup of "bucket-2" failed after failover of 'ns_1@10.1.3.74': {exit,
{shutdown,
{gen_server,
call,
[

{'ns_vbm_sup-bucket-2', 'ns_1@10.1.3.74'}

,
which_children,
infinity]}}}

Please look at the logs around 15:30 and 16:30 , where we see this message after failover of the node takes place.