DEC DATATRIEVE responds to its own software errors with severe
    error messages. If you see a severe error message, you have
    probably discovered a problem in the software.

    A severe error message consists of an error name and a message
    about the type of error. Following some of these errors, you
    return to DEC DATATRIEVE command level and can continue with your
    session. Sometimes a severe error returns you to DCL command
    level. In rare cases, the system or DEC DATATRIEVE does not
    respond to input from your terminal.

    If you encounter any of these messages, report them to the person
    responsible for DEC DATATRIEVE on your system and contact your
    DIGITAL software support representative. If you are eligible,
    also submit a Software Performance Report (SPR).