I get the same error with the twitter buttons if I put one in an icon Menu and then try to remove it from the menu. I think it has something to do with some javascript not refreshing when the widget that contains it is changed. For the twitter buttons the buttons stay visible in the menu despite the tiddler containing them no longer being part of it, and after the first time the error happens in response to almost any change in the wiki until it is reloaded.
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