rebalance failure when adding one node {ns_vbucket_mover,'-spawn_workers/1-fun-0-'}

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

{ok,replica}

}},
[

{ns_vbucket_mover,run_mover,5}

,

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

]}