Audio Ease Altiverb 6 doesn't work on Cubase Pro 8

Thank you for the reply, Tracker! I tried to do it, nothing changes, I even started to receive the following message: “Precess received an invalid buffersize Error ID 30800”, when the ASIO-Guard is activated for Cubase, and inactive for Altiverb… The empty plugin window is still there. The same when I deactivate the ASIO-Guard in general in Cubase, just without the error message…
I have no idea what’s wrong here?! There is no information about that on the internet…