my problem is, that I want to authenticate a public key from a friend of mine. But it has to be visible for everyone and it should be exportable. So I did the checkmark at "Authenticate visible for everyone (exportable)" (02.png) but I get an Error (03a.png) which only occurs, when I want to make a visible authentication. And I don't know what to do because I found nothing in web to this error message nor error code.
- GNU General Public License Version 2
The about dialog where it tells unknown windows version means it's Gpg4win-3.1.13 (the only version affected by T5056 )
Could you try this with the current Version 3.1.15 again? There were some changes that might have an effect.
The "general error" is pretty common when signing keys when Kleopatra's expectation of what the backend does do not overlap.
Alternatively you can use the command line "gpg --sign-key NAME_OR_KEYID" to do it on the command line without kleopatra. But it would be interesting if GnuPG on the command line would also run in an error or give you some kind of warning message or something that might explain why Kleopatra runs into this unexpected state.