ArtOfTest.Common.Design.Exceptions.ExecutionException: ExecuteCommand failed!
InError set by the client. Client Error:
System.ArgumentNullException: Value cannot be null.
Parameter name: SetCurrentDocumentMarkup. The document object is null. Unable to get markup. Probably the Html Document was closed prior to executing the action.
   at ArtOfTest.InternetExplorer.IECommandProcessor.SetCurrentDocumentMarkup(BrowserCommand& response)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessInformationCommands(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)
BrowserCommand (Type:'Information',Info:'DocumentMarkup',Action:'NotSet',Target:'null',Data:'',ClientId:'Client_91f5a288-fc1b-420c-8b10-6d024a5d8098',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'System.ArgumentNullException: Value cannot be null.
Parameter name: SetCurrentDocumentMarkup. The document object is null. Unable to get markup. Probably the Html Document was closed prior to executing the action.
   at ArtOfTest.InternetExplorer.IECommandProcessor.SetCurrentDocumentMarkup(BrowserCommand& response)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessInformationCommands(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')
InnerException: none.
 ---> ArtOfTest.WebAii.Exceptions.ExecuteCommandException
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Core.Browser.RefreshDomTree()
   at ArtOfTest.WebAii.Core.Browser.ArtOfTest.Common.IAutomationHost.EnsureStateIsCurrent()
   at ArtOfTest.WebAii.Design.Execution.ExecutionUtils.WaitForAllElements(IAutomationHost host, AutomationDescriptor descriptor, Int32 timeout)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)
   --- End of inner exception stack trace ---