I have the same problem.

Specs:

Windows 10 Pro x64

German System Language

Latest X2go-Client V. 4.0.5.2 (Qt - 4.8.6)

Error message in Debug Mode:

When I try to share a folder after connecting to a host, I get this message in the debug console:

And a popup windows with something like this (translated from german):

SSH-Deamon couldn't open his public key.

You have activated Printer and Folder sharing.

For this feature, a proper SSH-server must be running.

Printer and Folder sharing are going to be disabled

The SSH-server is not properly configured.

Be sure the public key exists.

Normaly this message shouldn't popup, because x2go uses his own internal ssh-server and creates all necessary keys itself.

------

Best regards,
Matthias