TOPIC: Another "Request failed" message

Hi, my site: tenniskafe.com have the same problem as many of users write here before me.

When I click on comment button is displayed message box with text: "Request failed" - this is on firefox.
On IE, I receive following message:

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Message from webpage

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Invalid xml declaration.

Contact the support ! and send the following informations:
error is line 3 position 3 >>ml version="1.0" standalone="yes"?>11107881![CDATA[

Tenniskafe is live site with very big number of daily users and this errors are very unpleasant and aversive!

Can you help me to solve this problem?

Здрасти, ако искаш може и на български да си говорим

I suppose that it was working in the past, because I see that you have a lot of comments. What have you changed on the site? Perhaps you installed a new plugin or something?

I'll need backend access + ftp access to debug it. Please use the contact us form at the bottom and send me the login details.

Поздрави,
Даниел

Thank you Daniel for solving my case.
Few developers will take customers problem personalty and do everything to find the problem, you are one of them.

Your help was priceless!