Example failure message:

Failure message:
'6/5/2013 3:41:15 PM' - 'Fail' : 50. Verify element 'ExitAndRunReportToolbarButton' 'is' visible.
------------------------------------------------------------
Failure Information: 
~~~~~~~~~~~~~~~
ExecuteCommand failed!
InError set by the client. Client Error:
System.NullReferenceException: Object reference not set to an instance of an object.
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessInformationCommands(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)
BrowserCommand (Type:'Information',Info:'ComputedStyle',Action:'NotSet',Target:'ElementId (tagName: 'button',occurrenceIndex: '9')',Data:'visibility',ClientId:'Client_5648ae5b-31ed-4c4f-9f54-55b5d56f77eb',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'System.NullReferenceException: Object reference not set to an instance of an object.
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessInformationCommands(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')
InnerException: none.

InnerException:
ArtOfTest.WebAii.Exceptions.ExecuteCommandException: ExecuteCommand failed!
InError set by the client. Client Error:
System.NullReferenceException: Object reference not set to an instance of an object.
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessInformationCommands(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)
BrowserCommand (Type:'Information',Info:'ComputedStyle',Action:'NotSet',Target:'ElementId (tagName: 'button',occurrenceIndex: '9')',Data:'visibility',ClientId:'Client_5648ae5b-31ed-4c4f-9f54-55b5d56f77eb',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'System.NullReferenceException: Object reference not set to an instance of an object.
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessInformationCommands(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')
InnerException: none.

   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.BrowserSpecialized.InternetExplorer.InternetExplorerActions.GetComputedStyle(Element targetElement, String style)
   at ArtOfTest.WebAii.Controls.HtmlControls.HtmlControl.IsVisible()
   at ArtOfTest.WebAii.Design.IntrinsicTranslators.Descriptors.VisibleVerificationDescriptor.ExtractData(IAutomationHost targetBrowser, DescriptorValueStore dataStore)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)