guestbook verification doesnt work

(Sorry for my bad english ...)

I have the latest version of the guestbook. But the verification does not work.
When I turn it on, then he shows the verification on the site.
But if you fill in he does not, he gives an error.

Why?

Thanks

It has to do with the way sessions are handled on your server. Please open a ticket with your web host.

what can be wrong??
is there a solution?

As I said, it has to do with the way your webhost has configured sessions. Your webhost has to fix the issue (nothing guestbook support can do).