EasyBlog breaks page after Joomla upgrade

Hi, I have recently upgraded my site to Joomla 3 (from 1.5). I followed your instructions and everything seemed fine until someone tried to write a new blog entry. The page broke. The URL is: http://www.permaforum.hu/permaforum/index.php/blog and you can see the error when you click on the Write button. Unfortunately I don't get FTP account from my host so I cannot send you FTP details.

Could you please help me figure out what went wrong?