Library /sys$common/syshlp/basichelp.hlb Compile time errors, REQSTREXP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  ERROR - The  program  contains  a  numeric  expression  in  a  context
  requiring  a string expression, for example, the file specification in
  an OPEN statement, or the default file specification in a  DEFAULTNAME
  clause.  Supply a string expression.