This error is sometimes seen in Nutritionist Pro Network on the client workstations when the user tries to launch the application.
If the error is seen it means the licensing on the server is no longer working so the best option is to relicense the server.
Please follow these steps to resolve your error
1. close the error message if still open.
2. go to the server and find the install path of Axxya Systems/Nutritionist Pro/Support Folder/
3. Find a utility called seplicenseonly.
4. Launch it and license the server again
5. once its licensed go back to the client workstations and the issue should now be resolved.