WatiN“无法投射COM对象”异常

14.04.2011 18:26:37 -> Test 1.2 (Subscriber type requests), error: Unable to cast COM object of type \'System.__ComObject\' to interface type \'mshtml.HTMLDocument\'. This operation failed because the QueryInterface call on the COM component for the interface with IID \'{3050F55F-98B5-11CF-BB82-00AA00BDCE0B}\' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

14.04.2011 18:26:37 -> Test 1.2 (Subscriber type requests), trace:    at WatiN.Core.Native.InternetExplorer.IEWaitForComplete.WaitForFramesToComplete(IHTMLDocument2 maindocument)
   at WatiN.Core.Native.InternetExplorer.IEWaitForComplete.WaitForFramesToComplete(IHTMLDocument2 maindocument)
   at WatiN.Core.Native.InternetExplorer.IEWaitForComplete.WaitForCompleteOrTimeout()
   at WatiN.Core.WaitForCompleteBase.DoWait()
   at WatiN.Core.IE.WaitForComplete(Int32 waitForCompleteTimeOut)
   at WatiN.Core.Browser.GoTo(Uri url)
   at WatiN.Core.Browser.GoTo(String url)
   at WebMonitor.Tests.Execute() ...