org.openqa.selenium.WebDriverException：未知错误

Question

我有一个应用程序，在单击按钮时会打开一个包含一些元素的模式。我能够完美地访问元素。但是，当我为用户输入中的一个条件选择一个元素时，它就失败了。确保我在此处应用的if else条件存在一些问题。但是我无法找出确切的问题。

我的脚本：

String options = driver.findElement(By.cssSelector("[class^='modal hide fade in']")).getAttribute("id");

List<WebElement> element = driver.findElements(By.xpath("//*[@id="+"'"+ options +"'"+"]"+"/div[2]/div/div/div/a"));

List<String> optiontype = new ArrayList<>();

for (WebElement e : element) {
optiontype.add(e.getText());
}

System.out.println("Pick an option: 0 - Document 1 - HTML5");

Scanner k = new Scanner(System.in);

String input  = optiontype.get(k.nextInt());

if (input == "Document") {

Thread.sleep(5000);

driver.findElement(By.xpath("//*[@data-type=\"Document\"]")).click();

WebElement lessonSearch = driver.findElement(By.xpath("//input[@id=\"jform_title\"]"));

lessonSearch.click();

lessonSearch.sendKeys(Constants.title);

driver.findElement(By.xpath("//button[contains(text(),'Save & Next')]")).click();

//Uploading Document

WebElement scormUpload = driver.findElement(By.id("document_upload"));

scormUpload.sendKeys(" /file/path/);

}else if(input == "HTML5") {

driver.findElement(By.xpath("//span[contains(text(), \"HTML5\")]")).click();

WebElement search = driver.findElement(By.xpath("//input[@id=\"jform_title\"]"));

search.click();

search.sendKeys(Constants.title);

driver.findElement(By.xpath("//button[contains(text(),'Save & Next')]")).click();

WebElement html5Upload = driver.findElement(By.id("tjhtmlzips_upload"));

html5Upload.sendKeys(" /file/path");
}               

发生错误：

org.openqa.selenium.WebDriverException: unknown error: Element <span data-js-attr="add-lesson" data-toggle="modal">...</span> is not clickable at point (593, 612). Other element would receive the click: <div class="modal-backdrop fade in"></div>