Dba.createCluster: ERROR: 1 table(s) do not have a Primary Key or Primary Key Equivalent (non-null unique key) on sys.sys_config

[babak zahedi]

Why i'm getting this Error on sys.sys_config ?

here is the full message in verbose mode :

mysql-js> cluster = dba.createCluster('myCluster');
A new InnoDB cluster will be created on instance 'cl@x.x.x.x:3306'.

=========================== MySQL Provision Output ===========================
Enter the password for server (cl@x.x.x.x:3306):

Running check command.
Checking Group Replication prerequisites.
* Comparing options compatibility with Group Replication... PASS
Server configuration is compliant with the requirements.
* Checking server version... PASS
Server is 5.7.19

* Checking that server_id is unique... PASS
The server_id is valid.

* Checking compatibility of Multi-Threaded Slave settings... PASS
Multi-Threaded Slave settings are compatible with Group Replication.

* Checking compliance of existing tables... FAIL
ERROR: 1 table(s) do not have a Primary Key or Primary Key Equivalent (non-null unique key).
sys.sys_config

Group Replication requires tables to use InnoDB and have a PRIMARY KEY or PRIMARY KEY Equivalent (non-null unique key). Tables that do not follow these requirements will be readable but not updateable when used with Group Replication. If your applications make updates (INSERT, UPDATE or DELETE) to these tables, ensure they use the InnoDB storage engine and have a PRIMARY KEY or PRIMARY KEY Equivalent.
You can retry this command with the --allow-non-compatible-tables option if you'd like to enable Group Replication ignoring this warning.


ERROR: Error checking instance: The operation could not continue due to the following requirements not being met:
Non-compatible tables found in database.
==============================================================================
Warning: The instance configuration needs to be changed in order to
create an InnoDB cluster. To see which changes will be made, please
use the dba.checkInstanceConfiguration() function before confirming
to change the configuration.

Should the configuration be changed accordingly? [y|N]: n