Add new plugin problem

When I try to add new plugin, it show an error on page where are listed all plugins. I tried to delete whole WordPress instalation and to restart instalation. Installed everything from beginning, but still all the same.

An unexpected error occurred. Something may be wrong with ww.wp.xz.cn or this server’s configuration. If you continue to have problems, please try the support forums.

Page where problem show up: http://www.balkaninfo.me/wp-admin/plugin-install.php