The valid data types for V_REPLACE() are defined in the V_REPLACE()
   function reference.  If FlexFile encounters a type which is not
   amoung these valid types, this error will be generated.

   In addition, if you make the mistake of using a pointer-field which
   points into one file as a pointer-field for a different file, FlexFile
   will again generate this error.  This is because the pointer-field
   is pointing to something other than the header which FlexFile pre-
   pends to each field.