How to use add_settings_error in register_setting callback

  • public function database_name_check($input){
    //debug
    add_settings_error('notice', 'lol', 'lol');
    if($this->wpdb->get_var($this->wpdb->prepare('SHOW DATABASES LIKE %s', $input)) == $input)
        return $input;
    else{
        add_settings_error('notice', 'lol', 'lol');
        return FALSE;
    }
}

    I can not understand why the error does not exceed, any suggestions?

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