redis集群添加节点，在move slot时报错

原有redis添加节点172.31.176.126:7000。但是到了move slot，敲完yes，就报了个错。请大神帮忙看下什么原因。
具体如下：
Do you want to proceed with the proposed reshard plan (yes/no)? yes
Moving slot 5461 from 172.31.176.80:7000 to 172.31.176.126:7000: /usr/local/ruby/lib/ruby/gems/2.3.0/gems/redis-3.2.1/lib/redis/client.rb:113:in call': ERR I don't know about node 582b32872a81acadea73048963fddc1887922d4c (Redis::CommandError)
from /usr/local/ruby/lib/ruby/gems/2.3.0/gems/redis-3.2.1/lib/redis.rb:2556:inblock in method_missing'
from /usr/local/ruby/lib/ruby/gems/2.3.0/gems/redis-3.2.1/lib/redis.rb:37:in block in synchronize'
from /usr/local/ruby/lib/ruby/2.3.0/monitor.rb:214:inmon_synchronize'
from /usr/local/ruby/lib/ruby/gems/2.3.0/gems/redis-3.2.1/lib/redis.rb:37:in synchronize'
from /usr/local/ruby/lib/ruby/gems/2.3.0/gems/redis-3.2.1/lib/redis.rb:2555:inmethod_missing'
from ./redis-trib.rb:931:in move_slot'
from ./redis-trib.rb:1258:inblock in reshard_cluster_cmd'
from ./redis-trib.rb:1257:in each'
from ./redis-trib.rb:1257:inreshard_cluster_cmd'
from ./redis-trib.rb:1701:in `'

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