Xebium iexplore got error message "JavaScript error (WARNING: The server did not provide any stacktrace information)"

[yujiayujia6]

fitnesse table is
|script |selenium driver fixture |
|start browser|iexplore|on url |http://nzakl20sv273:9081/ |
|do |open |on |/iBuilderBRC_Test |
|ensure |do |assertVisible |on|id=username |
|ensure |do |waitForVisible|on|!-id=password-!|with|fgd |
|ensure |do |type |on|id=username |with|CSOTL_3001|
|ensure |do |type |on|id=password |with|CSOTL_3001|
|ensure |do |clickAndWait |on|css=input.submit |

steps
|script |selenium driver fixture |
|start browser|iexplore|on url |http://nzakl20sv273:9081/ |
|do |open |on |/iBuilderBRC_Test |
|ensure |do |assertVisible |on|id=username |
|ensure |do |waitForVisible|on|!-id=password-!|with|fgd |
are passed

get error message for steps
|ensure |do |type |on|id=username |with|CSOTL_3001|
|ensure |do |type |on|id=password |with|CSOTL_3001|
|ensure |do |clickAndWait |on|css=input.submit |

error message is "EXCEPTION:java.lang.AssertionError: com.thoughtworks.selenium.SeleniumException: JavaScript error (WARNING: The server did not provide any stacktrace information)
"
use Firefox no any problem for above table.
can anyone tell me why I will get this error message

[raboof]

Do you also see a javascript error when you perform these actions manually from IE?

[yujiayujia6]

No, we do manual test for this system many times, before we try to do automation testing. Thank you for replay.

[raboof]

Well, the fact that you've done manual testing (and that it works functionally) doesn't mean there's no javascript errors in the console. Have you checked?

[yujiayujia6]

I also use following code in eclipse to test all actions are passed and no javascript error in console.

WebDriver driver;
driver = new InternetExplorerDriver;
driver.findElement(By.id("username")).sendKeys("CSOTL_3001");
driver.findElement(By.id("password ")).sendKeys("CSOTL_3001");
driver.findElement(By.id("submit ")).click();

[eskape]

This is (probably) one of the reasons why we're moving to "full" webdriver implementation. Work in progress. Thanks for sharing another example.

[raboof]

As @eskape correctly mentions, depending on what's actually going wrong it could be that this issue does not occur when using the 'fast selenium emulation' implementation which is now the default in newly built 0.13-SNAPSHOT versions.

If you're feeling adventurous you're welcome to build that one and try if it helps. This might well introduce some other issues, but I'd be happy to work with you to help resolve those.