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

  WARNING - The program was compiled with /NOLINES and  uses  a  keyword
  that  requires  line  number information.  For example, ERL and RESUME
  with line numbers both require  that  the  program  be  compiled  with
  /LINES.   If  you use a keyword that requires line number information,
  BASIC automatically overrides the /NOLINE qualifier.