Message Oracle NNL-00011 - no server with name string exists

ERRORno server with name string exists
CAUSEThe user issued a SET SERVER request and the current managed Oracle Names server was unable to translate that name into an address. Alternatively, the user issued a control program request to a specific server, and that servers name could not be translated into an address. Both problems are almost always caused by mis-typing the server name.
ACTIONRe-issue the request with a valid server name.