It's a Google Analytics error, been spoken about and a solution provided by Norman a few months ago. Try a search, see if you can find it, should be quite easy to find, use the error message as the starting point for your search.
Perhaps you didn't find the right one then as the one I recall was where he provided some Javascript to fix the issue. It's only experienced on the home page from memory and it's something everybody is experiencing. It's not about having correct code, it's about having the fix in place to fix what's there. I believe it is only an IE issue. You can't really have wrong code in place as actinic integrates it for you, it's what they've integrated that needs fixing.
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