fabric-mysql 5.6 Fabric添加主节点失败，日志如下，求高手解答，不胜感激！

[root@localhost log]# service mysql restart
Shutting down MySQL... SUCCESS!
Starting MySQL. SUCCESS!
[root@localhost log]# mysqlfabric manage stop
Password for admin:
Fabric UUID: 5ca1ab1e-a007-feed-f00d-cab3fe13249e
Time-To-Live: 1

Success (empty result set)

[root@localhost log]# mysqlfabric group add my_group 192.168.15.140:3307
Password for admin:
Fabric UUID: 5ca1ab1e-a007-feed-f00d-cab3fe13249e
Time-To-Live: 1

ServerError: The MySQL Server instance used as Fabric's state store cannot be managed.