One more suggestion. If you uncheck the “Allow Html” box in the template properties, it won’t try to render the iframe code in the builder. You willl just see the HTML code, but at least you won’t see the error message. 
One more suggestion. If you uncheck the “Allow Html” box in the template properties, it won’t try to render the iframe code in the builder. You willl just see the HTML code, but at least you won’t see the error message.
