If you're seeing this error message, it means that the application you're trying to authenticate with is not authorized to use CAS. CAS is a Central Authentication Service that allows applications to securely authenticate users.
If you're the administrator of the application in question, you'll need to register and integrate your application with CAS. This process is usually pretty straightforward, and there are plenty of resources available to help you get started.
If you're not the administrator, you'll need to contact the CAS administrator to resolve the issue. In most cases, they'll be able to help you get set up with the necessary credentials.
Learn more on CAS here:
https://brainly.com/question/26986135
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