我正在尝试使用 Selenium webdriver (Java) 从 YouTube 建议中检索搜索结果，但出现以下错误。请帮忙。
错误：
引起：org.openqa.selenium.remote.ErrorHandler$UnknownServerException：无法找到元素：{“方法”：“类名”，“选择器”：“gssb_e”}
构建信息：版本：'2.41.0'，修订：'3192d8a'，时间：'2014-03-27 17:18:15' 系统信息：主机：'localhost'，ip：'127.0.0.1'，os。名称：'Mac OS X'，os.arch：'x86_64'，os.version：'10.9.3'，java.version：'1.7.0_55' 驱动程序信息：driver.version：未知
代码
package test3;
import java.util.List;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
public class YoutubeSuggest {
public static void main(String[] args) {
// The Firefox driver supports javascript
WebDriver driver = new FirefoxDriver();
// Go to the youtube home page
driver.get("http://www.youtube.com/");
// Enter the query string "Ozzy "
WebElement query = driver.findElement(By.name("search_query"));
query.sendKeys("Ozzy ");
// Sleep until the div we want is visible or 10 seconds is over
long end = System.currentTimeMillis() + 10000;
while (System.currentTimeMillis() < end) {
WebElement resultsDiv = driver.findElement(By.className("gssb_e"));
// If results have been returned, the results are displayed in a drop down.
if (resultsDiv.isDisplayed()) {
break;
}
}
// And now list the suggestions
List<WebElement> allSuggestions = driver.findElements(By.xpath("//td[@class='gsq_a']"));
for (WebElement suggestion : allSuggestions) {
System.out.println(suggestion.getText());
}
//driver.quit();
}
}
youtube 建议生成的 HTML：
<table dir="ltr" class="gstl_50 gssb_c"
style="width: 585px; top: 39px; position: fixed; text-align: left; left: 230px; display: none;"
cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="gssb_f"></td>
<td style="width: 100%;" class="gssb_e"><table class="gssb_m"
style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne crazy train</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne no more tears</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne mama i'm coming home</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne paranoid</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne justin bieber</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne mr crowley</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne bark at the moon</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne interview</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
<tr class="">
<td style="text-align: left;" dir="ltr" class="gssb_a gsfs"><div
class="gsq_a">
<table style="width: 100%;" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width: 100%;"><span>ozzy<b>
osbourne dreamer</b></span></td>
</tr>
</tbody>
</table>
</div></td>
</tr>
</tbody>
</table></td>
</tr>
</tbody>
</table>