Error: Maximum Number of Users exceeded

Hi there,
sometimes, after testing for a while I get the Error Message above.
Please find a screenshot attached.
Is it a configuration or licence problem?

Best regards

Hello Mtthias,
have a look at your licensekey-file in the cis/cis/licensekey.

Perhaps the number of sessions is greater than your entry in

The developer keys of CAD are working with Threshold 3, usually.