Thanks for the post. The error message looks like it may have something to do with the find:
TextContent 'Exact' TB122
Has the text for the TextBlock changed on the page or is dynamic depending on user input for the page?
Please see the attached screenshot on how to change the find params for the failing test step. You can try changing TextContent to 'Contains' some text for the text block that will be constant through out the test run.
But just to confirm, I mentioned this in my reply to your other ticket. Is the TextBlock a customized version of the generic Silverlight tool kit TextBlock?
All the best,
the Telerik team
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