hbase一直好好的，突然hbase shell报以下错误

hbase(main):001:0> list
TABLE

ERROR: Can't get master address from ZooKeeper; znode data == null

Here is some help for this command:
List all user tables in hbase. Optional regular expression parameter could
be used to filter the output. Examples:

hbase> list
hbase> list 'abc.*'
hbase> list 'ns:abc.*'
hbase> list 'ns:.*'

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