Invitation issue

I create an event in eM Client for Google Calendar and added one attendee at Scheduling tab, choose send invitation, but eM sends me an error “16:12:33 Cannot send message (None of the email recipients were accepted by the server.)”. I see that in Outbound folder there is an event, but with blank SendTo field.
How can I fix this problem?

Please, try our newest release candidate version from… . It should work OK there.