ArtOfTest.Common.Design.Exceptions.ElementFindException: Unable to locate element. Details: Attempting to find [Wpf] element using 
Find logic 
 (Wpf): [AutomationId 'Exact' CellElement_5_0] AND [XamlTag 'Exact' textbox]

Unable to locate element. Search failed!

Learn more about finding elements here:
http://www.telerik.com/automated-testing-tools/support/documentation/user-guide/troubleshooting_guide/test-execution-problems/unable-to-locate-element.aspx
   at ArtOfTest.WebAii.Design.Execution.ExecutionUtils.WaitForAllElements(IAutomationHost host, AutomationDescriptor descriptor, Int32 timeout)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)