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The one reason I have found that this error message you received happens is that you may have bookmarked this "email this page" form at one time and by using the bookmark to return to it you will get this error.
You need to actually go to the page you want to send to a friend and then click the "email this page to a friend" link at the page you are at. This is the only way to avoid the error.
If this does not help please email me at email@example.com