/sys$common/syshlp/helplib.hlb FORTRAN, Error Messages, Run Time Errors, General, INVKEYSPE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  NUMBER:  49

  ERROR CODE:  F

  MESSAGE TEXT:  invalid key specification

  EXPLANATION:  A key specification in an OPEN statement or in a
  keyed access READ statement was invalid.  For example, the key
  length may have been zero or greater than 255 bytes, or the key
  length may not conform to the key specification of the existing
  file.