This is a generic error message shown in MI:Viewer when an error occurs and MI is being viewed in a browser on a client machine. Minimal information is displayed for security reasons.
To see more information about the error, log onto the MI application server where MI:Viewer is installed and repeat the operation in a browser on that machine.
Please email support if you require further assistance.
If your problem relates to GRANTA MI please attach the MI:Viewer logs and MI:Server logs from the time the problem occurred (these are typically located in C:\inetpub\wwwroot\MI\logs and C:\Program Files\Granta\GRANTA MI\Server\Logs respectively).