I have tried your Tell a Friend and it WORKS. It DOES send the mail. So, i suppose that the problem is that it doesn't find the
"returnpage" and it gives you the error message. if you get a better look at the script, you will see that at the end, there is a line like

header("Location: returnpage.html"); // returnpage is the same page of the form or another of your choice.

You need to change the returnpage.html with the actual name of the page where the visitor will get redirected after he has used the TAF script.

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