validate - unique - error message

Hello,

I am using code from the bakery tutorials to validate my form elements
for unique records.
http://bakery.cakephp.org/articles/view/checking-for-duplicate-records-unique-record
(I am using the code of comment no. 5 as I need to validate for a
unique combination of fields)

It works fine, but I did not manage to show error messages when
validation is not passed.

I uncommented
// $this->invalidate('unique_'.$field);
in app_mode.php
and put
echo $html->tagErrorMsg('User/unique_username', 'Enter another
username, this is already used.');
into my view but this gives me the error message
"Method HtmlHelper::tagErrorMsg does not exist"

What do I need to do?

Thanks for any help
Melanie
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