This particular error message doesn't ring a bell, but the flavor / situation does. The issue is most likely TabJolt having problems reading the response from Tableau. Not much that can be done in the short term except simplify the viz and/or try running a test in which we View (only - no interacting) with the Viz. We typically have problem with the interaction response.
I tried with ViewVizLoadTest option instead of InteractVizLoadTest in TabJolt Command line and still getting the same error.
Any other possible work-arounds?