The error dialog box contains a brief description of an internal
  inconsistency detected by the debugger.  If the cause of the error is
  not obvious, select the Help Menu on the Main Window, select
  On_Commands, select Messages, and scroll through the display until you
  can select the message code that is displayed in the error dialog box.
  You may find more information about the error in the OpenVMS System
  Messages and Recovery Procedures manual.