I had this exact problem. It has something to do with the new layout of Paypal and some of the coding. The error it's giving you actually give you the URL of the page it's trying to load. Once you are logged in, go to: www.paypal.com/cgi-bin/webscr?cmd=_profile-ach and it will bring you to the 'classic' version which has all the same features but works correctly :).
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