Hi Valera,
Regarding your issue, I've added a fix on your site and now the google's structured data testing tool no longer display errors. Please see
http://screencast.com/t/pytYtk1D
Below is the file I've modified:
JOOMLA/components/com_easyblog/themes/wireframe/blogs/latest/post.cover.php
The same fix will be added into next release of EasyBlog
Hope this help and have a nice day!