Selenium NoSuchElementException：无法使用RemoteWebDriver Java使用By.xpath定位元素

如何解决Selenium NoSuchElementException：无法使用RemoteWebDriver Java使用By.xpath定位元素

在本地计算机上运行拖放文件上载脚本可以正常工作并通过测试，但是当尝试远程运行相同脚本-RemoteWebDriver时，测试失败，但出现以下例外：

org.openqa.selenium.NoSuchElementException: no such element: Unable to locate element: 
{"method":"xpath","selector":"//*[@class='dz-message']"}
(Session info: chrome=62.0.3202.75)
(Driver info: chromedriver=2.35.528161 (5b82f2d2aae0ca24b877009200ced9065a772e73),platform=Windows NT 
 6.3.9600 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 50 milliseconds
For documentation on this error,please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.53.1',revision: 'a36b8b1',time: '2016-06-30 17:37:03'
System info: host: 'vc2coma1395994',ip: '10.146.2.48',os.name: 'Windows Server 2012 R2',os.arch: 
'amd64',os.version: '6.3',java.version: '1.8.0_211'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities [{applicationCacheEnabled=false,rotatable=false,mobileEmulationEnabled=false,

我尝试使用显式等待，但无济于事

    wait.until(ExpectedConditions.presenceOfElementLocated(By.xpath("//*[@class='dz message']")));

这是代码 driver.get（“ http://html5demos.com/file-api”）; WebElement droparea = driver.findElement（By.cssSelector（“＃holder”））;

    @FindBy(how = How.XPATH,using = "//*[@class='dz-message']")
    private WebElement target;

    public void dropFile(String filePath){

      File file = new File(filePath);
      int offsetX =0,offsetY=0;

      if(!file.exists())
        throw new WebDriverException("File not found: " + 
      file.toString());

      JavascriptExecutor jse = (JavascriptExecutor)driver;
      WebDriverWait wait = new WebDriverWait(driver,30);

    
      String JS_DROP_FILE =
            "var target = arguments[0]," +
                    "    offsetX = arguments[1]," +
                    "    offsetY = arguments[2]," +
                    "    document = target.ownerDocument || document," +
                    "    window = document.defaultView || window;" +
                    "" +
                    "var input = document.createElement('INPUT');" +
                    "input.type = 'file';" +
                    "input.style.display = 'none';" +
                    "input.onchange = function () {" +
                    "  var rect = target.getBoundingClientRect()," +
                    "      x = rect.left + (offsetX || (rect.width >> 1))," +
                    "      y = rect.top + (offsetY || (rect.height >> 1))," +
                    "      dataTransfer = { files: this.files };" +
                    "" +
                    "  ['dragenter','dragover','drop'].forEach(function (name) {" +
                    "    var evt = document.createEvent('MouseEvent');" +
                    "    evt.initMouseEvent(name,!0,window,x,y,!1,null);" +
                    "    evt.dataTransfer = dataTransfer;" +
                    "    target.dispatchEvent(evt);" +
                    "  });" +
                    "" +
                    "  setTimeout(function () { document.body.removeChild(input); },25);" +
                    "};" +
                    "document.body.appendChild(input);" +
                    "return input;";

      WebElement input =  (WebElement)jse.executeScript(JS_DROP_FILE,target,offsetX,offsetY);
      input.sendKeys(file.getAbsoluteFile().toString());
      wait.until(ExpectedConditions.stalenessOf(input));

  }