Thanks for posting in the Tableau Community. I have not been able to find any information on the error that is returned.
I might consider also trying to post on the Tableau GitHub page regarding the error if you are able to reproduce it with a sample.
My comment will also bring this post back to the top of the feed. Hope this helps!
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I hope that you got this sorted out since I'm about 6 months late to this questions. But I stumbled across this searching for something else so wanted to chime in.
I'm pretty sure that the issue you're hitting here is that the way you're instantiating the Viz class is invalid. You are using:
var viz = new tableau.Viz(url)
The constructor for the Viz class requires three arguments: domNode, url, and options (see API Reference - Tableau ) and you are only passing one. You need to provide a value DOM node where the viz will be rendered, the URL of the viz itself, and any options you want to apply to the viz.