ArtOfTest.Common.Design.Exceptions.ExecutionException: Timeout trying to connect to Silverlight App. ---> System.TimeoutException: Timeout trying to connect to Silverlight App.
   at ArtOfTest.WebAii.Silverlight.SilverlightApp.WaitUntilExtensionCreated(String extensionCall)
   at ArtOfTest.WebAii.Silverlight.SilverlightApp.Connect(Int32 timeout)
   at ArtOfTest.WebAii.Silverlight.SilverlightApp.GetApp(HtmlControl host, Int32 timeout, Boolean catchedOnly)
   at ArtOfTest.WebAii.Design.Execution.ExecutionUtils.GetHost(IAutomationHost topBrowser, ElementDescriptor element, Int32 hostFindTimeout, Int32 appConnectTimeout, Boolean cachedSLAppOnly, String& error)
   at ArtOfTest.WebAii.Design.Execution.ExecutionUtils.GetHostEE(IAutomationHost topBrowser, ElementDescriptor element, String& error)
   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 ---