* message: The kind of file is unsupported.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsDesignFileIsUnsupportedType(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_design_file_is_unsupported_type));
        return this;
    }

    /**