Hello,
Below is the screenshot you've asked.
Error appears when I try add any application to any folder on desktop. I
use "Plus icon" inside folder (English probably "More applications" /
Polish "Wiecej aplikacji"), then for eyeblink appears "Trwa wyszukiwanie
popularnych aplikacji" (Searching for popular applications) and then erro
message.
The only way to add new app to any folder is to drag it from app list over
the folder icon. It's not a huge problem, but I thought it's worth to
report an issue.
Of course the phone was restarted (few times) :)
Regards, Darek Gąsiorowski.