I've seen that before too. It seems to be intermittent and the way I "solved" the issue was to start KeyShot then click the Render button in Alibre. Once the model opens in KS it seems to act normally the next time I need to render a model.
If you see it again, click on details and post a screen grab of the whole error message. You also want to send that information to Alibre with the steps you took leading upto the error.
My recommendation is not to use subsequent changes. (Windows )
Uninstall KS, download KS V9.2 and carry out the installation with the necessary settings.
It takes 10-15 minutes, so it should not be a problem.