WP_Error Object
(
    [errors] => Array
        (
            [username_exists] => Array
                (
                    [0] => Error: This username is already registered. Please choose another one.
                )

            [email_exists] => Array
                (
                    [0] => Error: This email is already registered. Please choose another one.
                )

        )

    [error_data] => Array
        (
        )

)