Calibre version is 4.8.0 64bit, lubimyczytac plugin is 2.0.38
I think the problem may be on my part, but this log doesn't say anything useful to me.
Goodreads plugin works fine, on the other hand. Lubimyczytac plugin cannot find any books for me. And it seems it finds the link for the book just fine, but still gives no results.
Also, I never had any problems with this plugin, only when I installed Calibre on my new computer.
Here's full log, if it's going to be any help
https://pastebin.com/Hqn78HCr