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  Message:      RT177
 
  Text:         Attempt to cancel active program
 
  Severity:     Fatal
 
  Explanation:  You have tried to remove a currently executing program
                or its parents or grandparents, from memory.
 
  Resolution:   Once your program has terminated you will need to
                recode your program to ensure that you do not attempt
                to cancel a program (or its parents or grandparents)
                while it is still being executed.
                                    -♦-