VMS Help FORTRAN, Error Messages, Compilation Errors, INVLEFSID  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SEVERITY:  F

  MESSAGE TEXT:  Left side of assignment must be variable or array
  element

  EXPLANATION:  The symbolic name to which the value of an expression
  is assigned must be a variable, array element, or character
  substring reference.