Hey Daydreams,
You have to delete the action manually from your database.
please log in to phpmyadmin (or that one you use to manage your database on the server), navigate to the table "ow_base_authorization_action", search for the name "create_0" and delete it.
Otherwise you can execute the sql command:
DELETE FROM `ow_base_authorization_action` WHERE name = "create_0"