The module is trying to create the directory /var/www/.libnet-openssh-perl but it can't. It needs it to place a UNIX socket there for communication with the OpenSSH client.

The module documentation has a TROUBLESHOOTING section that discusses most of the issues you can encounter in detail. You should read it. But in any case, fell free to ask here again if that doesn't solve your problems.

you seem to know a lot about using this module

Hey, I should! I wrote it!