}
                    logger.debug("Failed to copy {}", filename, e);
                    throwValidationError(messages -> messages.addErrorsFailedToInstallPlugin(GLOBAL, filename), this::asListHtml);
                }
                new Thread(() -> {
                    try {
                        final PluginHelper pluginHelper = ComponentUtil.getPluginHelper();

     * @param property The property name for the message. (NotNull)
     * @param arg0 The parameter arg0 for message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsFailedToInstallPlugin(String property, String arg0) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_failed_to_install_plugin, arg0));
        return this;
    }

    /**