CE backup doesn't work in Spock and Watson

[root@hera06-s818 ~]# rm -rf /data/cbbackup_dir

[root@hera06-s818 ~]# /opt/couchbase/bin/cbbackupmgr config --archive /data/cbbackup_dir --repo default

Backup repository `default` created successfully in archive `/data/cbbackup_dir`

[root@hera06-s818 ~]# /opt/couchbase/bin/cbbackupmgr backup --archive /data/cbbackup_dir --repo default --host http://172.23.96.117:8091 --username Administrator --password password --threads 16

Backing up to 2016-06-23T05_23_14.48075409-07_00

Copying at 0B (estimating time remaining)                                                                                                                             0 items / 0B

bucket-1                [                                                                                                                                                ] 100.00%

[root@hera06-s818 ~]# /opt/couchbase/bin/cbbackupmgr backup --archive /data/cbbackup_dir --repo default --host http://172.23.96.117:8091 --username Administrator --password password --threads 16

Error backing up cluster: The most recent backup `2016-06-23T05_23_14.48075409-07_00` did not finish properly. You can either resume this backup from where it left off by re-running the backup command and using the --resume flag. To delete the unfinished backup and start again use the --purge flag.

[root@hera06-s818 ~]#