OPCUA error message for invalid username and password is unclear

opcua.ua.uaerrors._auto.BadSessionNotActivated: "The session cannot be used because ActivateSession has not been called."(BadSessionNotActivated)

This error message is given, when an invalid username and password is supplied to the OPC UA connector or if the user does not have sufficient permission to perform a requested operation. This reasoning should be more clearly conveyed in the error message.