o  data link error

    An error was reported by the Data Link layer on the load command.

 o  unrecognized client

    There is no client with the specified identification.

 o  unrecognized circuit

    There is no circuit with the specified identification.

 o  required argument omitted

    Both the Address and System Image arguments are required.  If
    they are not present in the command line, then a Client must be
    specified which can provide that information.

 o  entity class not supported (OpenVMS)

    MOP is not registered with EMAA.  The NET$MOP process is
    probably not started.  For instructions on how to restart the
    MOP process, refer to HELP NETWORK_MANAGEMENT MOP.