-3180 is not a standard error and not linked to a specific issue in Now Up-to-Date, Now Contact, or Now Server Manager. Since it is happening from all your systems when trying to create a new category, I believe it is a communication error between the local file and the server database. Have you tried restarting the machine the server(s) is running on?
Is it happening from Now Up-to-Date or Now Contact? And, which version of Now Up-to-Date & Contact are you using, under which OS version?
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Don Norcross Technical Support - Now Software Inc
No, we haven't tried restarting the server, but we'll have to work on that. It's only happeneing with Now Contact. We're running Now Contact Version 5.0.2 on OS X Version 10.4.9
Historically, we've had problems with creating new databases without meaning to. It's possible someone tried to put a lock on the program to keep us from generating new, unwanted databases?