qb45ener.hlp (Topic list)
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-54
:nBad File Mode
This error occurs when the program is trying to
  ■ Use PUT or GET statements with a sequential file
  ■ Use a FIELD statement with a file not opened for
    random access
  ■ Write to a file opened for input
  ■ Read from a file opened for output or appending.
 
ERR code 54