Rails 2 blog screencast, ajax error

I’ve been following the '15 minute blog ’ screencast on the rails
site. Got to the part when you add ajax functionality to the comments
form and when i try to post a new comment this way in Firefox, i get
an alert window with the following message:

RJS error:

TypeError: null has no properties

and then, when i click ‘ok’:

Element.insert(“comment”, { bottom: “<div class=“comment” id=
“comment_12”>\n

\n Posted less than a minute \nago</
strong>
\n rails \n

\n\n” });
$(“comment_12”).visualEffect(“highlight”);
$(“new_comment”).resetlocal();

I’m pretty sure there are no typos in the code, I’m new to rails so
any help is welcome. Thanks in advance

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