I'm using Kleopatra Version 3.1.4-gpg4win-3.1.5. I try to import private key (my private key is in a separate file, just a plain text) with GUI and I've got it imported without any problems.
However, when I want to decrypt some file, there is a popup that asks me for a passphrase. Since I have no passphrase, I leave it empty but this not work.
Probably I'm doing something wrong, but I can't figure out what (I've searched the Internet for some tips, but without any luck ;/)