无法在htmlunitdriver中使用xpath定位元素

Question

public void Testcase(HashMap<String,String> testDataMap, WebDriver driver) throws Exception {

    if ((testDataMap.get("Browser").equals("HtmlUnitDriver"))) {

        driver = new HtmlUnitDriver();
        ((HtmlUnitDriver) driver).setJavascriptEnabled(true);

        Static_wait_Time.IdealWait_Time();
        driver.findElement(By.xpath(.//*[@id='content']/div/div/div/div/div[2]/div[1]/div[1]/span));