Error enabling postgres feature in sub-server

Hello, I enabled the PostGres db in webmin and then attempted to enable the PostGRES feature in a sub-server. However I received an error as follows.

Creating PostgreSQL database rs …
… PostgreSQL database failed! : SQL create database “rs” with owner=“xxxxxx” failed : role “xxxxxx” does not exist at …/web-lib-funcs.pl line 1385, line 1.

I deleted the sub-server and tried creating a new one and still get the same error.

Any help is much appreciated.

Thank you

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