I install !joomlacomment and they looks very good and perfectly match my web site but I found 1 error. After I install component and include it on my news when I wrote coment I got notice: Request failed and in textbox text is gone and I got this:

<?xml version="1.0" standalone="yes"?><post><id>502</id><published></published><noerror>1</noerror><debug></debug><captcha><![CDATA[<a title="kliknite za osvježavanje nove slike" href='javascript:JOSC_reloadCaptcha()'><img src="http://www.hnkhajduk.com/components/com_comment/joscomment/captcha.php?refid=ed207fc41e574288673b67ea5150139b"; alt="Security Image" />
<input type="hidden" name="security_refid" value="ed207fc41e574288673b67ea5150139b" /></a>]]></captcha></post>

After all coment is still post and can be seen in administration panel waiting for accept by admin.

What can I do to fix this problem?