Hi Nazar!
Did you check this already:
I’m getting “Sorry. No data so far”. What’s up with that?
There are a number of reasons that might explain why you are seeing this message: no one has seen or commented on your posts/pages since WordPress Popular Posts activation, you should give it some time; your current theme does not have the wp_head() tag in its <head> section, required by my plugin to keep track of what your visitors are viewing on your site; WordPress Popular Posts was unable to create the necessary DB tables to work, make sure your hosting has granted you permission to create / update / modify tables in the database; if you’re using a caching plugin -such as W3 Total Cache- you need to clear its cache once right after installing/upgrading this plugin.
If you have, then please post your site’s URL so I can go take a look.
