ERROR 1396 (HY000): Operation CREATE ROLE failed for 'application_rw'@'%'

[Elom Atsou Agboka]

Hello everybody.
I have a small problem in MySQL.
When I try to create a role with this syntax:

CREATE ROLE 'application_rw'@'%';
It does not work.

However, when I try with the following syntax:

CREATE ROLE 'application_rw'@'localhost';
that works.

I feel like when installing and configuring MySQL, I chose an option that restricted me to only placing commands at the localhost level.

How can I change this?