What does receiving a 401 error from Netsuite REST API imply?

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A 401 error from Netsuite REST API implies that the client is not authorized to access the requested resource. This error occurs when the client has not provided valid authentication credentials or the authentication token has expired. The server responds with a 401 HTTP status code and a message indicating that the client needs to authenticate before accessing the resource. To resolve this error, the client must provide valid identification credentials or obtain a new authentication token.