}
        }
        if (StringUtil.isBlank(fileName)) {
            throwValidationError(messages -> messages.addErrorsDesignFileNameIsNotFound("designFile"), this::asListHtml);
        }

        File uploadFile;
        // normalize filename
        if (checkFileType(fileName, fessConfig.getSupportedUploadedMediaExtentionsAsArray())

     * message: The file name is not specified.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsDesignFileNameIsNotFound(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_design_file_name_is_not_found));
        return this;
    }

    /**